I don't know but they shouldn't be too expensive. Around here you can get an alright glass bong for £6.50 but it depends on how good your smoking experience to be.
I'm in Michigan, and a decent pipe from a headshop would cost anywhere from $30-$85,so cheap at headshops usually mean small and/or basic color scheme. You could however check out some gas stations or cigar/tobacco shops, they sometimes have them; about 1 out of 5 I go to have had some type of glass or devices. For a bong, I'd try Craigslist or the headshop. Usually run from like $80 to like shit, $400? Yea that sounds good, 80-400. I'd try some online stuff tho too