Amazon UK offers the Harry Potter: The Complete 8-Film Collection on Blu-ray Disc / Digital HD for $33.41 (£26.99). At checkout, the price drops to $27.83 (£22.49). With $3.81 (£3.08) for shipping, that's a buck under our November mention and the lowest in-stock price we could find by $24. (For further comparison, we saw a similar US version for $40 last December.)
This Blu-ray set is region-free, and the films themselves will play on US Blu-ray players, but note that the extras and special features may not. It ships from the UK and should arrive in about two weeks.