Google King Tut Thread and you can find a number of places to buy it. Superior will sell it for $25+ per cone, but I usually pay about $18. You can use it in the bobbin as well, but I've found that Bottom Line (also from Superior) does very well in the bobbin. Bottom Line is a thinner thread, so you get a lot more on the bobbin and it lasts longer. I have used cheaper threads, but I always end up coming back to King Tut. A lot of LA quilters also use Signature threads and really like them. They are a bit less expensive. I started out with black and white and the basic neutrals then just ordered as needed. If you have a business license you can buy wholesale and get better prices. Sew Thankful has good prices on King Tut.