Williams-Sonoma offers its Peppermint Bark 1-lb. Tin for $12.99. Coupon code "SAVENOW" cuts it to $9.74. With free shipping, that's $3 under our January mention and the lowest total price we've seen. (It's a current price low by $27.) It's made with semisweet chocolate, white chocolate, and peppermint candy bits.
Note: It's currently on backorder (seen during checkout), but still available at this price.