The Buffalo Linkstation Pros (LS-250GL) are just starting to show up as available on Pricegrabber, etc. It varies from week to week, I think there must have been some delays in shipping and/or high demand. Standard roll-out stuff. Buffalo appears to have tweaked the name a bit, also, last minute (was Linkstation II), which may have led to some confusion.
What you might want to do is also search for some of the other models in the line:
These seem to have a lot more sellers and stock right now than the LS250GL (and LS500GL), which must be popular.
Observationally, the Linkstation Pro pricing points still seem a little high to me. Now, if they're selling out, that's the market, but they're pretty close on a $ (US) per Gigabyte, and for a single disk box, that's a tad high. Of course, you're paying right now for the performance, and the competition (Maxtor Fusion, for example, granted that's a RAID capable box) is somewhat higher right now. Still, we have other networking companies, like D-Link (see DNS-323) refreshing their offerings, and every sign then that the Buffalo is priced too high, long term. But for now, the market determines the price, and there's not a lot out yet that's forcing Buffalo down cheaper. That will probably change very shortly.