Amazon UK offers the Battlestar Galactica: The Complete Series on Blu-ray for $31.71 (£23.99). In-cart it drops to $26.42 (£19.99). With $4.07 (£3.08) for shipping, that's $16 under the price Amazon charges in the US, although we saw it for $3 less last December. It includes all 75 episodes on 20 discs.
Of note, although the episodes themselves will play on US Blu-ray players, the extras and special features may not.