This is the supplement recently reprinted by Moon Designs (As Borderlands And Beyond). While the single-book format has some drawbacks (no separate maps or player handouts) it is relatively affordable (compared to eBay) and collects some extra material from other sources, too.
The Tentacles Press "Beyond Pavis" supplement also includes additional material for Borderlands.
(Both are listed as available from
www.tradetalk.de - but check before ordering if you want to be sure they are actually in stock. I would expect Borderlands And Beyond to turn up at Warehouse 23 and Leisure Games in the near future. Leisure Games probably has Beyond Pavis, too).