check out SRK tech talk, and SRK's trading outlet. I"m pretty sure someone was selling some ps2 sticks for like 125 in trading outlet (i think it was riotblade but i'm not sure)
edit: you can also mod a TE/SE or any stick really (as long as its common ground) to work for PS2 as well using a PS1 dualshock or analogless pad, e.g. my good friend hakami's TE which i did a while back
http://shoryuken.com/f177/check-out-my-new-arcade-stick-thread-part-deux-201537/index598.html#post9988030