For yarn, I use a local yarn shop or buy online from mostly independent yarnies or small companies. I also buy yarn at fiber festivals--and then once I see it in person, I will support that person in the future.

For diamond painting, I mainly buy from Diamond Art Club but have some from Craftibly and Everyday E Deals and Diamond Painting Bliss. But the DAC ones are the best quality ones by far.

Fiber for spinning I also buy from independent fiber suppliers and small farms. I have a couple of fleeces from Shepherds Hey farm.