hi;
I have no experiance with bi-orbs other than seeing many inappropriatly stocked with danios, tetras, goldfish etc.
Bettas are, IMHO, the only thing that is suitable for them.
if you want one, which are extreamly expensive, check out ebay.co.uk(not ebay.com)
there are often many of these on there and I'm sure someone would ship to you.
there is also a new version called the Bi-ube whish has a greater surface area but it is even more expensive.
HTH