Agreed - craigslist would be your best bet. You could consider Aquabid.com as well... though I am not sure how you would go about shipping them. They are certainly worth more than your LFS
is offering, but remember they are in the business to make money... breaking even doesn't leave room to pay the electric bills, pay employees, or turn a profit. And while they are worth more than $5-7 certainly, the problem will be finding the market, and finding someone who is willing to pay for them.