Amazon UK offers Warehouse 13: The Complete Series on Blu-ray for $25.26 (£20.39). In-cart, it falls to $21.05 (£16.99). With $3.82 (£3.08) for shipping, that's $7 under our March mention and the lowest total price we've seen. (It's the best deal today by $42.) It features 64 episodes on 15 discs, along with deleted scenes, gag reels, and commentaries.
This Blu-ray set is region-free; the episodes themselves will play on US Blu-ray players, but the extras and special features may not.