I have some refurbished (factory sealed) Dell desktops and laptops for sale. What are rules regarding posting them here? Thanks guys.

Heres a line from the Non-RC Swap and Sell:
Commercial Items: You MUST be a HobbyTalk Supporter to post commercial/business items in these Swap and Sell forums. A business is anyone that buys/manufactures items for resale.

Either that, or I'd talk to Hank (Hankster).
Dave