I don't know if you are interested in this stuff, I know I have been wanting some...but even if not used for training, I imagine it would be good play too!
AGILITY
Also, do you have any children't resale/consignment shops near you? I know around here, we have tons of them and they are all full of gently used Little Tykes and other brands of plastic outdoor/indoor toys.
Also, when yard sale time rolls around...that might be a good place to look also.