DBB19540

I USE ATTRM CAMERA SERVICE AND WONDER IF I CAN PURCHASE SAME PANASONIC CAMERAS FROM SOMEONE ELSE AND IF THEY WOULD WORK AS LONG AS I BOUGHT THE ATT OUTLET ADAPTOR? ALSO ATT HAS HCM581A-D ADVERTISED AS INDOOR/OUTDOOR FOR $1200.....AMAZON HAD HCM581-A FOR $800 (ORIG PRICE SHOWS $11000) BUT DON'T INDICATE I/O FEATURE. COULD THE "D" ON THE END MAKE A DIFFERENCE OR ARE THESE THE SAME CAMERAS?(PHYSICALLY LOOK THE SAME) ANY INFO APPRECIATED....