Many Walgreens have Brita water pitchers on clearance for $8.49 right now. When purchased, they give out $3 in Register Rewards for a future purchase and there's also a printable $5 coupon for any Brita system which brings the final price down to $0.49!
In order to get the coupon, look for a link in the “Go Green, Save Green” box. You'll have to signup on the site for a free account and then you'll be prompted to print out the coupon. Also, some people have mentioned that their local Walgreens were already sold out of the Brita, so you might want to call ahead.
[via Deal Seeking Mom – thanks!]