I think there is a lack of effort put in people sales threads and it shites me quite frankly.
Here is an example from one of my FS threads which is pretty self explanatory.
PAYMENT: Cash or Bank deposit
CONTACT: In thread or PM
ITEM: Nerf Recon CS-6
CONDITION: Excellent / Brand New In Box
PRICE/POSTAGE: $20 pick up or $25 posted to your door
INFO: Included is all accessories and 6 darts
PICS: *Insert picture here*
I've added in PRICE/POSTAGE in the same line as I think personally you should know what your willing to let your goodies go for and a rough estimate on what you think postage would cost.
In my opinion Make me an OFFER/ Shoot me an OFFER etc shouldn't be acceptable, make a magic number in your head then run with it.
Use this If you need to: Blaster Value Guideline
Just my 2c