I would appreciate knowing what it should have cost to replace some parts

What is your question?

Firstly let me say sorry this is so long, but so is the nightmare of having it worked on. It began with starting issues, erratic starts at about one no-start in 15 to 20, then progressively became worse. It would click, but not turn over. Then as it became more often I took it to a Nappa Mechanic locally and he said it was the starter, he replaced it and I brought it home. The very next morning it did the same thing, so I called and he said to bring it back in the starter was probably faulty. He replaced it a second time, I brought it home, the next morning I tried to start it again and it did the same thing, he said to bring it in and after I did, the other mechanic in the shop opened the battery wells (which by the way THEY had just cleaned the terminals and put Vaseline on the wires a few weeks earlier as part of routine maintenance) the wells were dry as a bone and they said it needed replaced. (well yeah, especially if they didn't maintain it) Then after the new battery too, and almost 500.00, it happened again the next day, it wouldn't even make a noise when I tried to turn it over AND to boot, it wouldn't release the key. I called the mechanic again, he said I "shouldn't leave the door ajar OR the key in it...!!!!" Hello, I have had the car for 10 years, it is garaged, I am not stupid, I would never leave the key in or the door ajar. so I took it back and he fiddled with the battery, said he couldn't make it reproduce the no start. So I took it home and watched as it became worse, not having the additional funds to do more when I felt he not only let me down but insulted me. soooo,5 months later still all the while occasional no starts, Monday it wouldn't even start after multiple attempts, I called a tow truck and the driver opened the hood and with the key on, used a couple of screwdrivers to start it, he said it wasn't the starter or the battery, which I now believe it never was, he said to tell the mechanic it was between the keyswitch and starter. I took it to him again as it is close to my house and I thought he would see he had made a mistake, he called the next morning and said he spent 3 1/2 hours diagnosing it (even with all the previous information)So I now have a fee for 3 1/2 hours of him staring at it. Can anyone give me ideas on what It SHOULD cost. I don't trust him anymore.