I have my road bike on a website to sell and had gotten this response:
Thanks for your reply,i am okay with the pictures but this is how i will want us to seal the transaction cos i dont want any delay at all.So,all i am going to do is to contact my associate in the USA to issue you a certified cashiers check of $7500 which
will be for both the shipping and your own money.
So all i will want you to do when you recieve the check, is to hold
out your own money which is $1500 and send the remaining shipping funds through western union VIA to me. So if this terms are okay by you i will need your contact address and phone number so that i can forward to my associate in the USA who will be issueing you the check.

Personally, I think it is a scam. I haven't done much online buying/selling so I am a little leary. What do you guys think?