Midtown comics does it and they bag and board single issues. But you can probably find a place closer to you if you call around.
As far as recieving anything in the mail, find out if you can have things sent to your job, that’s definitly something that can help preserve the quality. And depending on where you work, sometimes people will be a bit more careful handling your stuff and ditto if you have a mailroom service at your job.
You can always get a P.O. Box at a Post Office too, they really take good care of things and stuff goes from Post Office to Post Office so you are really safe. IIRC it doesn’t cost too much to get one, you pay a flat rate for the entire year.
Where you live, if you have a mailbox with a lock and key you are probably alright, more or less.