Best way to value old ammo

Over the years, I purchased a fair number of odd lots of mixed ammo, often because I needed something obscure in the lot. I now have a bunch of assorted old ammo that I want to get an idea of if it is worth. Some of the ammo looks like it came from a vintage ammo dealer because it is sorted in little baggies and labeled.

So, what's the best way to get an idea of what these are worth? Is there an eBay for vintage ammo that I can look at past sales?

Thank you!

A lot of ammo gets sold on www.gunbroker.com and you can research prices there. I once sold off all my collector-type ammo and used the gunbroker site. They also sell a lot of current factory ammo.

DG

Plus one on Gunbroker but if you don't have original boxes, the cartridges need a headstamp or some other feature that notes that they are vintage ammo.

Tim