Where to find some .onion marketplace urls

Hi everyone,

While I have a decent idea of how Tor generally works, I've never used the service very much in terms of surfing around .onion websites.

I'm currently in need of finding and have a look at some .onion marketplaces/ecommerce-sites (weapons is my main interest, but I imagine most marketplaces do have multiple categories).

Since the visibility problem is especially true for this - pretty volatile - kind of sites, I was wondering if there were some 'must-know' link aggregators for these kinds of sites.

A 'backpage of the internet' maybe? :)

If that's not the case then I assume the first google results are good enough for the general weapon buyer.

Thanks!