Ok, so I haven't actually bought anything from Acme Klein Bottles yet, but I really, really want to get a Klein Stein.

This store's online setup looks like it may just be a hobby for someone - I've seen much more professional designs, but the product has a very strong appeal to my geeky side. I love the thought of having a Klein bottle, or, better yet, the Klein Stein just because they are so intriguing.

 These aren't cheap. The Klein Stein is currently $80, which is why I don't have one yet. Give me time. But there are lots of other, more affordable items in there. Various sizes of Klein bottles, wool Klein hats and more make up the inventory.

The bottles are made from clear borosilicate glass, and the sales text is quite... appropriately humorous. It's a fun site to read even if you aren't ready to buy.