For the TB community's benefit: I can't agree with telling anyone who's place of residence you are at for a one-time transaction that you are carrying.
While it may seem smart at first, that person now knows you have a weapon and the first thing they will do after holding you up is search you for it. If you don't tell them you're carrying, and they don't ask, you can hope for a moment of dumb from them where you can deploy your weapon and avoid the hospital or morgue trip. And that's all.
I don't trust "people", that's why I have friends knowing where I will be, how long I plan to be there, and I will text them pre- and post- transaction. If they don't hear anything in a reasonable amount of time they are instructed to call the police.
I don't go for anything other than a screaming deal on CL anyways, so generally the price agreed is the price agreed and that's it.
Peace,
Greg