Recently I have found some pretty cool bigbongs on this good online headshop likebongs.com/ and should say it looks simply amazing and cool. These guys have a wide range of bongs on any taste and pocket. I saw a couple of examples on their website and think I can afford some for my hobby. All the best
Home Depot or any hardware store. Instructions available courtesy of you tube. and It would be a lot cheaper than buying one online or in a "head shop"