My instant gratification needs was books. I love books. I quit all book clubs( the S&H was ridiculous). What bookstores are left I stay out of them. I made friends with my library and when the impulse hits me I can order books though the reservation lists although it takes longer than Amazon to get notice I can go pick up the books.

Maybe you need to pick up an actual physical hobby that keeps you off the web where you find these amazing deals? Take up woodwork or leather making or something?