Harry Potter - The Complete 8-Film Collection Blu-ray 2011 Region Free: : Daniel Radcliffe, Emma… for $36.08
This is the complete set of Harry Potter movies on Blu-ray. The discs are Region Free, so they will play on any Blu-ray player. This is the British version, so the movies are the same (though the first movie is titled Philosophers Stone instead of Sorcerer's Stone).
Since people in the US do not have to pay VAT, the price drops to 22.62 (which converts to $36.08). Shipping is $4.91, for a total cost of $40.99 (according to Google's currency converter).