Found one or two actually reasonably priced models on Turbosquid now too (although these are in obj or 3ds format)... I didn't realise there was anything on there around the $5 mark... but there is!

However, Hornet3d's suggestion is still the winner so far, I think ;-)

EDIT: Well... actually... it's maybe between that and the MarchHare set suggested by Jazzmin...