Amazon has an interesting BD-related "lightning deal" going on now: for a very limited time, you can buy
Dollhouse: Season one for only $26.99 (61% off MSRP). This offer expires today at 10 a.m. PDT, or when stock runs out.
The price history for this title indicates that the cheapest it has been at Amazon is $25.49 (during a Deal of the Day).
Thanks to forum member "fbc."
Update
This deal has expired now.