the question becomes if you want a one hander and cheap... really cheap and good quality for what you pay is the crkt wrangler, sells for 20cdn in my local... but it's a nail nick opening lockback.
otherwise "cheap" is the CS voyager line. knock up the price to what most of BFC considers cheap and you have about 1/2 of spyderco for selcetion, mainly the delica and endura in frn.
I've got a great slipjoint that dates a bit, was under $10usd when it was purcashed, and I got it on a contest here. 2.5" edge length, 3" blade length, lambsfoot shape slipjoint.