When I last bought a Firm Feel box I called a local scrap yard in their area and had them bring a core to Firm Feel, the shipping from Canada was over $100 at the time.
Wish I'd have thought of that. Shipping a core back from NY cost almost half the $150 core charge.
Black Betty: '69 Charger RT: 440 6 pack, TKO600 5 speed, 3.73 Dana. Sinnamon: '69 Charger RT: 440, 727, 4.30 8.75. High School Sweetheart. El Grande: '98 Grand Cherokee 5.9 Limited.