I also feel that Ultimarc provides excellent service.
But partially due to the fact the US dollar is taking a krap in the outhouse,
the Ultimarc trackball is $35 now + $12 shipping.
For those that will be getting a translucent ball also, thats another $15 bucks.
Which brings the total to around ~$62.
At eBay, you can get a 2 1/4" translucent Happs trackball for around $48 + shipping.
So there's no clear winner on which is a better buy.