My SIL bought a kitty litter bucket of thread for $5 a couple of years ago at a yard sale. It's mostly C&C I think. There's not a color not in that bucket. For the most part they are small spools and are fine. I'll use whatever is on hand as long as it's not glaringly off color for what I'm working on. My Viking isn't picky about thread so I've had no issues.