I was in Wilderness Aware down by BV yesterday and saw that they're selling off Farmer John wetsuits for $20 each. I've picked up good booties for $5/pair or cheaper from outfitters before along with splash gear, helmets, and the works.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse