[slidertogrid]

I would look at ebay completed listings. from that you can judge saleability and get an idea as to what items will sell for. I sell a few radios at RT and I price them around half of the price ebay will achieve, working on the principal that there are no fees with RT but the potential "audience" is smaller than the auction site.
I usually manage to sell most of what I take. Anything not sold after lunch can always be reduced but bear in mind a lot of buyers will make offers anyway.
One point I would advise though is to put prices on everything as buyers often don't like asking and it will also save you time in answering questions.