A good SRT 101 would fetch something around £45 and up depending on condtion, accessories. You would be better off putting a lens on the camera for sale but a lot would depend on the lens as to whether it would be better bundled or sold seperately. To give you an idea I paid £70 for a totally mint, fully working SRT101 with a mint Minolta 58mm f1.4 compete with original leather case. That combo could hit £150 on a good day.
The 58mm f1.4 is desirable as a bokeh monster of you like that sort of thing.
Prices are variable, seem to go cheap in US, expensive in UK, crazy in Japan.
Like any film camera film tested is the gold standard. Seals may have perished out and mirror bumper could be gone but thats easy to replace. SRTs have potentially failing light cells so metering can be wrecked but almost any camera tech can fix most of the ills.
Dammit what I am saying......they are highly toxic, super dangerous artefacts and should only be handled by experts in old cameras like me and Ismael