You can now find all of the 18+ Sunday League info at it's new website at http://atlantamsbl.sharepointspace.com/18Sunday/default.aspx
For right now, if you need to pay a league fee you can do it below.
Pay your 2013 league fees via PayPal
League fees for 2013
League fees can paid in Full ($250+$8) or half ($125+$5)
You can pay your manager direct with cash/check or use PayPal.