Walmart has Brother thread here. It's comes in a four or six pack of different colors. It's not cheap but not too pricey compared to other big name brands. I have some and it's good thread. I use it in bobbin and top. 50wt thread doesn't mean anything unless you know the ply. Aurifil is 50 wt 2 ply, Connecting Threads is 50 wt 3 ply, just for an example. Each takes a different size needle. It took me a long time to understand thread weight, ply and type. If your machine threads on the outside like most of the older models then lint isn't a problem. The inside threading many of the newer machines have, the lint will be a problem - no where for it to go but pile up inside. The more thread guides on a machine the better. That's why so many vintage models stitch so great with most any thread.