Respond and state your concerns. If the party is (seems) truly interested, then I would provide (or ask for) a phone number and encourage a conversation. Never promise to send anything without first receiving payment or sending COD requiring certified check (money orders are sometimes OK, but often used by scammers too). PayPal can act as a good third party and the cost to the seller is minimal for the security it provides. Good luck. Use your instinct; if it smells like a scam, it probably is a scam.
When I offer to purchase I always provide the phone number for the seller to contact me. This doesn't mean this party is not good; maybe just as inexperienced as you.

[This message has been edited by cassp (edited 09-02-2004).]