I'm not exactly sure what their gameplan is with these. I've been hearing rumors that they will put them in production, that this is it, and that there will also be a Slash AFD 1 watt or 5 watt head/combo, which really tickles my fancy as I love the AFD100.
Anyhow, I'd say wait until NAMM comes around to see what Marshall's gonna do. If they put them out again, they will be lower priced I'm guessing. If they don't, then I'd hop on ones on eBay very quickly while they're still routinely going for around $600, maybe cheaper. As we all know with these sellers, if they find out something makes their item more rare, they'll charge $6,000 instead of $600!