Amazon offers Prime members Bioshock: The Collection for PlayStation 4 or Xbox One for $24.99 with free shipping. (Target charges the same for PS4 and Xbox One.) That's $5 under last month's mention and the lowest price we've seen. (It's also the best deal now by $5.) It includes remastered HD versions of BioShock, BioShock 2, and BioShock: Infinite, each with all single player DLC.
Note: The PS4 version at Amazon is expected to ship within two to four weeks.