u can get elite comms doing the weeklies on yavin 4, rishi, oricon, makeb, & tactical. Plus there are level 55 & 60 flashpoints, and operations (these can get u ultimate comms). at level 60 u can buy fron class vendors:
basic comms 186 gear
elite comms 192 gear
ultimate comms 198 gear
i save my basics for level 60 /186 gear. don't unpack the comms that the birdman on rishi gives u at the end of the cut scene. it isn't counted against the cap until it is unpacked.