A compression fitting fits on the outside of a tube. It doesn't matter what the inside measurement is, you need the OD to be the same. If your using 1/2" tubing you need a 1/2" compression fitting.
I just got a bunch of swagelok stainless compression 1/2" tube x 1/2"npt for $11 each with free shippin on eBay. Looks like he's sold out now, but i found eBay to be the cheapest I looked everywhere.
I have not found a place in Bergen county that has good price on them. I got all of mine online for $25 each with shipping, I see them on craigslist.com every once in a while.
I do not have an electric set up, I'm using propane with burners. The stand is just called an electric stand. There are lots of electric setups on here, just do a search.