And by on the cheap I mean "Can be had in the vicinity of $100 on a regular basis".
You should be able to find something here.
I feel like I'm constantly plugging these but I just love my aqua puss and supa puss so much, they inspire me daily! I'm sure you could get an aqua or echo puss for near that price used? There are different flavors of delay though, so what are you looking for?