I've also sold brass on ebay before they stopped it. I buy my brass at a nickel a pound over the going scrap price for yellow brass, which last week was $1.95 a pound in Eugene, OR. That means I paid $2.00 a pound for what I bought from the local range, but that includes a whole bunch of .22 brass, loaded rounds, some steel and aluminum cases, and everything is mixed together, along with some debris. I spend several hours separating all the different calibers, and sorting out what can't be reloaded.
The reason I'm telling you this is so you can get an idea of what the brass is worth. At the very least, it's worth scrap price ($1.95 a pound). And at the most, it's worth the labor it took to sort it out and separate all the junk from it, and the convenience of you not having to do it.
From there you should be able to figure out what a fair price is. I can tell you that the old days of buying brass for $20.00 a thousand are long gone, though.
Hope this helps.
Fred