Electronics & Tech - Best Deals and Sales at Home Depot
Update: Amazon is expired but Home Depot has them for $3.72 with free shipping. The 8-Pack of AA is $3.79 at Amazon and $3.99 at Home Depot.
Amazon has the 8-Pack of Duracell Optimum AAA Batteries for $3.72 - 5% off with Subscribe & Save (can cancel anytime) - 10% off coupon (check “Save an extra” box, eligible on first S&S order for this product) = $3.16 with free shipping on $25+ or with Prime.
Runs for up to 120 minutes, then automatically recharges and resumes cleaning to complete the entire job.