Walmart offers the Chamberlain Surge Protector for Garage Door Openers for $16.82. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $2 under last week's mention and the lowest price we could find now by $12. It's designed for Chamberlain garage door openers made in 1994 to present.

Update: The price has dropped to $15.38.