Came across this, it's a free veterinary clinic in Alston. You just give what you can. Also is first come first served and open on Saturdays. Alston is just about an hour from you and not far from the pike.
Welcome - Merwin Memorial Free Clinic For Animals, Inc.
(617) 782-5420
542 Cambridge Street
Allston, MA 02134
Found this one in Worcester. They give the first appointment free and have an exotics vet on staff. If you were able to go there then you would only have to pay meds and follow up appointments.
Veterinarians in Worcester, MA | VCA Abbott Animal Hospital
VCA Abbott Animal Hospital
Phone: 508-853-3350
Fax: 508-853-2408
21 East Mountain Street
Worcester, MA 01606
Here's another site with really good info on available services in MA that are free or decreased rates.
Get Help from Phinney's Friends |Phinney's Friends