I bought an Ultimate Kit from Tandy, had most everything I needed to get started.
Lately, I've been eyeing Ebay for old tools. Some can be had pretty cheap and in good shape. Some are in lots with other stuff.
There is a few sellers that sell used stuff for more than new pricing, calling it Vintage. Rough, rusty stuff still available. You just have to know what your buying.
It can be time consuming, But I would prefer older American made than anything new that comes from over seas. It's not hard to tell a well taken care of tool.
Personally, I wouldn't waist my money on circle jigs and things. There is always a way around it. My extensive set of sockets yields many size circles.
And I often use the Free Demo of Delta Cad for designs, print it out and trace it on.
I never heard of the 2 you mentioned as suppliers. But that doesn't mean anything.
A quick look, I found this https://www.staples.com/Chartpak-Templates-Plastic-Circles-10-x-7-Smoke-1204I/product_2704016