must be compatible with DOCSIS, otherwise it will not work, preferably DOCSIS 2.0 that Comcast requires. Try this link: http://www.tigerdirect.com/applications/category/category_slc.asp?CatId=160&
OR
http://www.newegg.com/Product/ProductList.asp?Submit=BROWSE&manufactory=1566&bop=and&srchInDesc=cable%20modems

tiger direct seems to have more of a choice than motorola. But motorolas are just as good. I have one myself, but went to Wal-Mart cuz I could not wait for the shipping and it was on sale.
On more of a personal note, you will be paying upwards of 60 to 80 dollars for a good modem. Happy hunting.

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