The search box should be upper right corner, right below the drop box with your screen name on it.
As far as I can tell, VIP membership allows you to sell here. I used to think you couldn't see the dealers collectors without being a contributing member, but I'm not sure now. I was browsing the collector section before I chipped in. Also, if you upgrade, they'll stop hounding you to upgrade. It's worth it, and can be had for only $15.
If you go Platinum, for $100, you can curse in your posts and one of the admin will stop by and give you a massage. There's one admin on each major continent, except Africa, so you're likely to be covered.