One way to get samples is to buy repair kits.
Rave Water Trampoline Vinyl Repair Kit
Advanced Elements Boat Repair Kit
Inflatable Boat Repair Kit, 3 X Pvc Patch, 1 X 30g Glue and 1 X Valve Wrench by benflyworld
Tear-Aid
Inflatable Moon Walk Bounce Bouncer House Repair Patch - Tear Aid 6" x 12"
Patch A
by Tear Repair