Basic Combustion Gun Kit* $30.00 
This kit is by far the most popular.  Sometimes finding pieces and messing around with igniters is jus too much work.  Included here is everything that you will need to quickly build your own basic combustion cannon in 10 minutes or less (+glue drying).  Everything  from the barrel and chamber and the fittings to a pre-made flint igniter plug.  By far the best deal on the web.
  Basic Combustion Gun Pre-Made $44.00
This is by all measures, the cheapest place on the web that you will find a pre-made, completely assembled combustion gun.  It is entirely ready for immediate use.  Pre-glued and painted also including a pre-made igniter plug.  The best deal there is out there.

Paint Color

Tennis Ball Barrels $14.00
People just keep on asking if I would sell 2.5" PVC barrels.  These unique sized barrels snugly fit a tennis ball inside.  Why keep on using potatoes when you can reuse tennis balls?  Complete with bushing that reduces to either a 2" slip, 2" thread, or 3" PVC slip sockets.  Specify on below.  All barrels 36" long.
Adapter Type

 

Short Bazooka Kit* $144.95  This has to be one of the best deals out there.  A full kit including everything from detailed plans to PVC fittings and pipe.  Here is everything that you would need to build your very own bazooka.  It works identical to my own.  Only difference is the air chamber is 2.5' long, making it more easy to construct and more portable.  Detailed instruction on how to create the dual push-button release system are included.  Why bother trying to find all the right pieces when you could get them all right here?  Detailed plans on CD-rom in Adobe Acrobat format. 
  Bipod Kit $18.00 This is an essential to accurate spud gun firing.  Aiming a combustion gun can be one of the most difficult things to do safely and accurately.  This device attaches onto the front of any combustion cannon and stabilizes it.  It basically gives you a 'third hand'.  With all the parts needed to quickly construct a bipod with folding legs, this is a must have for all serious spud gunners. 

3/4" Solenoid Valve $18.99
Into pneumatic gunning?  This is what you want.  They are beginning to diminish in some stores across the country, but I have 'em.  Ideal for modifications, experiments, or just pneumatic launching, these are what you want.  3/4" female threaded both ends.  Operates off 27v DC .

1" Solenoid Valve $25.99  I happened to find one of these.  They are particularly hard to get a hold of in some parts of the country because fewer places are carrying them.  This is a 1" in-line solenoid valve.  Both receptors are female threaded.  Best valve there is for mass air release.  I only have this one so get it while its still here.  Operates off 27v DC.


0-200 PSIG Pressure Gauge $8.00
Finding the right pressure gauge is always a pain.  You don't want the $50 glycerin filled ones and you don't want a gauge that has microscopic increment markers either.  Here is the perfect gauge for all pneumatic spud gunners.  Brass stem; 2" face. 0-200 PSI readings.

   

Schrader Valve $5.99  These things are considered one of the hardest things to find for pneumatic gunners.  This brass inflation device screws into a 1/8"  or 1/4" female threaded receptor.  It seals much better than a tire valve and they are easily reusable because of their threads.  The 1/4" threaded valve (left) is sturdy enough to be screwed in to a PVC wall eliminating the hassle of having to find somewhere for the thread.  An ideal modification for any pneumatic gun.  
Thread Size

Bazooka Plans $8.00  The plans are finally finished.  Included on a CD-rom in Adobe Acrobat format is everything you need to know to construct your own bazooka capable of awing just about anyone.  From parts lists and where to get stuff, to numerous 3D CAD drawings and illustrations, these have it all.  A must have addition to anyone's arsenal.

Hovercraft Plans (HOVER II) $5.00  By popular request, the plans for HOVER II are complete.  Including numerous 3D CAD drawings, suggestions and modifications, and many pictures of my own craft, its everything you need to build a vehicle that defies gravity in one afternoon.  CD-rom. Adobe Acrobat Format.

Flint Igniter Plug for Combustion Guns $14.99  Tired with messing around with BBQ igniters and all those wires and contacts?  This is the perfect solution.  It is a pre-made flint igniter plug for 3" or 4" combustion chambers.  Just give the knob at the end at flick and a spark will be produced to ignite a combustion chamber.  This is by far the most reliable igniter I have seen.  Its flint can always be replaced.  Includes spare flint inside knob.
Plug Size
   
 

*please note that it is dangerous and likely that you would never get your order if the PVC welding chemicals were included in these kits.  In this day and age it would be better not to include these items.  You find the necessary chemicals in about hardware store or Walmart.