I have an acrylic bong that cost me about...$20 american, works great. Just find something that you won't break while you're high and that you like.

IMO, fancy looking glass bongs are a waste of money, at least at my stage in life. I live with roommates and we all get pretty stupid when we're high, and we've already broken pieces (Rommy broke my $90 glass bubbler, piece of art but shit happens)

Just remember that if it's glass it'll be easy to break, so if you tend to trip over things and what not, I wouldn't recommend it. Otherwise, go for it.