Amazon UK offers Star Wars: The Original Trilogy Episodes IV-VI on Blu-ray for $19.66 (£15.99). Add it to your cart and it falls to $16.39 (£13.33). With $3.79 (£3.08) for shipping, that's $12 under our February mention and the lowest total price we've seen. (It's also a price low by $15.) It includes A New Hope, The Empire Strikes Back, and Return Of The Jedi.
This Blu-ray set is region-free; the movies themselves will play on US Blu-ray players, but the extras and special features may not.