Try http://ellen.warnerbros.com/; there's a link to "Shop."
Also, if you Google "Ellen Degeneres" you'll get to another site (not the one listed above, but something similar). And if you scroll down the side of that page, there is a link which supposedly takes you to Ellen Degeneres products; I'd imagine that also might be where you'd find what you want.
In either case, be a careful shopper!
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them