The oral meslamine-based drugs are quite expensive. You have a few options including discount cards offered by the medicine manufacturer and also ordering directly from Canadian Pharmacies.
There is an
Asacol HD Patient Savings Card (a similar card is offered for other oral meslamine's such as Lialda). Those cards typically reduce the out of pocket costs for your medicine but it is still quite pricey.
Canadian Pharmacies are another option available to you. In the USA, their are no low cost, generic forms of oral meslamine. However, elsewhere in the world, you can buy generic and save money.
A recent thread from 3/14/2013 talks about
the Canadian options.
Best of luck to you,