Lateral movement of implants, revision needed
Your revision would be fairly straightforward with a combination of using an acellular dermal matrix, possibly new implants and some fat grafting. These procedures should be covered by insurance since you had a diagnosis of breast cancer. Keep looking in your area for a plastic surgeon who takes insurance. It can sometimes help to actually call your insurance company to ask who in the area is in your network.
Your lateral displacement is not uncommon for implant based reconstruction. Capsulorrhaphy and coupled with judicious use of acellular dermal matrix and mesh may be an option. There are many good reconstructive surgeons that accept insurance and in general I recommend one that is close to you so aftercare can be better facilitated.