The batteries are pretty easy to find - I found them at a drugstore, and of course at Radio Shack.
Congratualtions - the Electro X is a camera I really love, I have two but unfortunately the second one battery check works but the meter doesn't. They are a bit larger than Spotmatics, but very comfortable to hold, and the LED meter of course is easy to see.
And DAMN those are nice lenses. The 60 Macro by itself should be superb. I also have the 28 serial no Vivitar, quite nice and petite, and I don't like 135's as a rule, this may be my favorite.
The estate sale sure was a worth while trip for you