Amazon has an interesting BD-related "lightning deal" going on now: for a very limited time, you can buy Firefly: The Complete Series for only $25.49 (71% off MSRP). This offer expires today at 2 p.m. PST, or when stock runs out. The lowest price for this title was $34.99, at another Lightning Deal in November 2009. Update: all discounts have been claimed.

Source: http://www.blu-ray.com