Budget and snowboarding can be a dangerous mix sometimes..especially on craigslist..
Minimum i would say your looking at atleast 250-300 bucks for a bottom of the barrel setup with boots/bindings/board. 150-200 for a used board/binding combo, and another 100 for the cheapest boots you can find in the store as buying used boots is stupid. Its like buying someones used nike's they wore for 3 years....i'd suggest against it.
Looking on craigslist theres this guy in Vancouver BC selling a older Burton Custom...could try offering him 75 for the board and then buy some better bindings.
Atomic Hatchet with Technine bindings for 90..hes posted it several times so he will go cheap..again the bindings are shit but offer 50-75ish bucks and see what he says...