Chris,

Do you know of any links to pictures of the specialized fitting?

They're called "Transition Unions". The only example I could find is at:

http://plumbing.hardwarestore.com/52...vc-unions-and-
couplings/transition-union-101534.aspx

That's all one line, so watch the word wrapping...

Should I be able to get this at Lowes or Home Depot

I bought ours at Lowes, but I've also seen them at Home Depot, and our
local hardware store. They're usually in the same area as all the other
CPVC fittings. Some have metal rings joining the two halves, others have
plastic rings joining the two halves. Either would work, but I prefer the
metal rings.

All the ones I bought are for CPVC, not PVC. If you're plumbing supply
lines for your water, you should use CPVC anyway.

The fittings come in a variety of configurations. I used two types:

1. A brass drop ear elbow with the gasket and CPVC fitting on the bottom.
I used these for all of our shower heads, and everywhere I was going to
install a shut off valve.

2. A straight "union". Female brass threads on one side, CPVC fitting on
the other. I used these at our hot water heater, and anywhere I installed
a water hammer arrester.

Another concern I have is theres only about 2 inches of copper pipe
left coming out of the wall. Once I make another cut I wont have much
left to work with.

Two options.

1. Leave your current copper male fitting in place, and get one of the
transition unions that have a brass female thread. Then just thread on
the new fitting with teflon tape.

2. Heat the fitting with a torch as others have suggested and pull it off
instead of cutting the pipe. Clean up the end before sweating on the new
fitting.

One note... Be sure to slip the joining ring over the correct end of the
pipe, and facing the right direction, before gluing or sweating the
fittings. I forgot to do that once or twice and had to cut out the lines
and redo them, with another $5 fitting.

Take care,

Anthony