Usually you can get extremely good deals from someone who is taking down their tank. I know this guy who works in my LFS
, and he recently got 100lbs of LR
for 20 bucks!!! Obviously this is ridiculously cheap, but, if I were you I would try to feel the guy out. If he needs to get rid of it, he may just give it away.
My advice is: don't offer him much at all for it, and don't worry about insulting him with a lowball price, because you can always get LR
cheap if you look around...especially check out you local fish clubs. Usually membership is free, and around here they have auctions every so often, where you stand to save some real money!!!