streetsonline.co.uk has two-disc (4 episodes) boxes from Farscape seasons 1 and 2 on sale for GBP 12.99 (-10% till Tuesday, effectively GBP 11.69). I ordered 5 boxes (10 discs / 20 episodes) for GBP 63.80 shipped to US (~$93).

D'OH! I wish they'd done this before I bought them. I've been buying the sets (and now deluxe editions) from Bensons World as they come out. They're really starting to pile on the extras and 1 episode in the second season 3 box set has a commentary.