Interesting... Hopefully they're not getting out of the belt business. It's my understanding that LPS contracts with a belt manufacturer specifically to produce Z-series belts. So if they're sold out, I wonder if it's just because there is a backlog for some reason at the manufacturer, and not that LPS has actually stopped ordering the belts to be made. Tho if it was the later I'd think that LPS would change their website to say "discontinued" (or remove them entirely) instead of just "sold out".
Maybe I'll grab another another Z3100/Z3200 belt tho just in case...