A poster on the Home Cooking board asked me where I buy bunderfleisch, so I thought I'd post it here:
Murray's Cheese, in Manhattan - and they do mail order as well:
I don't see it on their website, but have purchased it in the store and would be surprised if they wouldn't sell it via mail order if one called. FWIW, I've had good luck giving cheese there as gifts to people outside NYC.
Any other sources?