Amazon.com: Keen Ramps - Skateboard Grind Box - 4ft or 6ft Long - Skate Grind Box for Skateboards, BMX Bikes, Scooters, & Roller Blades - Professional Skateboarding Ramps for Home - Made
South Bay Skate Co - Wedge Skateboard Ramp - 10" high x 24" wide x 42" long Skateboard – South Bay Board Co.
Kicker Ramp - 12″ high x 2′ wide x 3′ long – SB Skate Ramps
How to build a skateboarding GRIND BOX (Easy and strong!) - YouTube
HOW TO MAKE A CHEAP D.I.Y SKATEBOARD GRIND BOX 2.0 - YouTube