In 2013 I put together a group buy for sealed US Digital encoders. You can see all the details in this thread:
http://www.chiefdelphi.com/forums/sh...d.php?t=116899
We absolutely love them.
Despite what the product page says (
http://www.usdigital.com/products/en...otary/shaft/s4) these are available for purchase. I just got off the phone with the sales rep I worked with on the group order, and they are available for same day shipping.
If someone wanted to put together another group buy to get the price down, we would be interested in participating. But, fair warning, during build season might not be the best time to put one of these together.