If you want to browse materials, go to https://www.barlowstackle.com/
Just about everything you may want to price is here, plastic and hand ties.
To start, I'd go with hand ties. With hand ties, you can be more creative and it's more rewarding, IMHO. I've done both.
Plastics, you need to be right with the color mix up front, or you throw some plastic away. And you mix the colors before you heat the liquid, so you can't tell exactly what you have until the liquid is ready to pour or shoot, whichever, you choose.
But it's all fun.