I dealt with the same guy at John Deere Landscapes last year. I was looking for a way to hold down our seeding on the bank. There is at least one company that makes a mulch with a tackifier in it and JDL sells it. He wasn't much help at all. I think that unless you are buying by the pallet he doesn't want to talk to you.
I ended up finding Soiltac. It is basically Elmer's glue. Mixed 40 to 1 with water it can be sprayed over seeding and it will prevent the area from washing out in a pretty good rain. The best thing is they will sell it in modest quantities.
http://www.soiltac.com/
