Looking for Used Iphone 4s. A, B, C grade

Looking to buy all iphone 4s used A, B, C grade. Will buy 100-300 every week. Offer me. Looking for regular supplier. Saat International LLC (DBA Y&Z Wireless) Taimoor Altaf 777 S central expressway Suite 4-H Richardson, tx 972-900-3145 saatint@hotmail.com skype- taimoor.altaf