4-Pack Duracell 21/23 12V Specialty Alkaline Battery $3 + Free S/H w/ Amazon Prime

4-Pack Duracell 21/23 12V Specialty Alkaline Battery $3 + Free S/H w/ Amazon Prime. Thumb Score: +10. 4 pack of 21/23 batteries super cheap on Woot. Used for garage door openers/some home remotes/etc. 'Real' list price IRL seems to be about 2 for $6, so these are effectively 75% cheaper than what you'd normally get.