Must buy the pair to get this pricing (or find something else in the sale to make it a multiple of 2), as they are part of Amazon UK's 2 for ?10 sale . As of this posting, the combined price is $22.08 shipped or $21.24 if you pay in GBP with a credit card that doesn't charge a foreign transaction fee.
Add both to your cart to see the promotional pricing:
Beverly Hills Cop II [Blu-ray]  [Region Free]
Beverly Hills Cop III [Blu-ray]  [Region Free]