www.canasacare.com
I was in their program for a year, it's wonderful.
I've heard Asacol HD has a card but not Asacol 400mg.
http://www.altsampling.com/asacolactivate/
I take Asacol 400mg, it's $20 a month with my insurance. Sometimes it's a struggle to pay the $20. I have about 5 other scripts/mo that are $20+ each