I recently discovered another program that i would like to use on my blog. Their inventory picks up the slack on products that my primary program doesn't offer. I don't see anything in the TOS about it. Is there a general rule that you can't offer two different retailers that offer the same type of product? I should add that one only offers downloads, and the other only offers physical delivery of the product. They do not provide the same service, just the same type of product, music.
If it isn't stated in their TOS, then go ahead. I am with Moreniche and they don't mind if you offer competitor products as well. Make sure to check both the TOS of both companies though.