Target and Costco may technically have terminals, but they do not have them enabled. Walmart's are not properly enabled - they will allow a chip card to be swiped or dipped (and if it can be swiped, the main security benefit is gone). Also, Walmart's only allow CREDIT cards to be dipped, EMV debit cards are refused ("transaction cancelled") when dipped.

A lot of merchants have terminals that are disabled, if that counts. It's a long list...