Amazon.co.uk offers The Big Bang Theory: Seasons 1 to 7 on Blu-ray Disc
for $47.02 (£30.22). At final checkout, it falls to $39.19
(£25.18). With $4.79
(£3.08) for shipping, that's the lowest total price we could find by $46. It includes all episodes from seven seasons.
Of note, although the episodes themselves will play on US Blu-ray players, the extras and special features may not.