Who cares? What a waste of time this question is, however, if you have nothing else better to do, then I fully understand why you have asked the question...
I don't know about you, but I won't bother trying to find out how many items they have. My focus is on the product I can successfully promote and earn some referrals in the process. Don't waste your time trying to count how many products are in their catalog.
There are probably millions of products on there. That is a lot. Thanks for posting this question. I found it useful and interesting to think about... Food for thought!