Hello,
I am a Jet fan also. I have bought new ammo from The Old Western Scrounger and had good luck with it. He has it as Model: 6560 for $49.95 for 50 rounds
I bought two boxes when I got my first Jet. It was good freshly-loaded ammo and gave good brass for reloads. It grouped fairly well, but the Jet is VERY bullet sensitive. Midway just did a run of brass for the Jet. They still have some. It is Remington brass. 50 new empties for $54.99, Product #: 660147. Might want to get some quick. they only make it every few years.
Reloading is the only way to go, unless you have excess cash. You must use good dies. Single-loading on a Bonanza Co-Ax works well for me. I will not attempt to use my Dillon RL550B progressive, due to brass loss from neck failures. I prefer Rifle primers due to the high pressures. The S&W shoots well as long as you keep the chambers dry.
Good Luck!
Arman4461