I have an article about making all slimes on my spotless sploshing blog, and I just linked to and recommended a bunch of stuff in this other thread - it's about stringy slime but my article covers all types and has a USA supplier. https://umd.net/forums/how-do-i-make-this-stringy-kind-of-slime
Basically methylcellulose and add colourant to it is probably your best best - do some small batches and experiment til it looks how you want it to