Skatoramps - Sells step by step plans to build a variety of ramp models. [Best viewed in IE, may cause errors in other browsers.] - http://www.skatoramps.com
Hill Brothers Studios, Inc. - Offers video plans to help build a mini halfpipe. - http://www.easyhalfpipe.com/
SteelSun, Inc. - Specializing in ramps, grind rails, fun boxes and quarter pipes. - http://skateboardrampsandrails.com
RampSodia - Offering plans to build a variety of models. - http://rampsodia.com
RampHelp - Sells blueprint instructions to build ramps, as well as completed models. - http://www.ramphelp.com
Universal Industrial Products - Features pre-assembled skateboard ramps, grind rails, kits, ramp plans and videos, and related accessories. - http://www.ramps.com
SkateProducts - Grinding rail systems, kicker ramps, and ollie jumps for skateboarding, in-line skating and BMX. - http://www.skateproducts.net