Welcome Churchhaus!
There are a lot of sources for M. Basjoo. eBay is one of them, though you might need to become more familiar with the Sellers to be more or less assured that they are reliable, before you order.
Sandy, a member here, I believe offers Basjoo for sale. Here's a link:
Northern Tropics Greenhouse - Musa Basjoo- Hardy Fiber Banana, Very Hardy 10 inches tall
Also, check out this thread here:
what is the best website to buy a banana plant
Happy banana growing!
Chong