I adore using prewounds. Magnaglide prewounds come in many colors that match and you can easily do "close enough" with the bobbin. I absolutely love magnaglide bobbins, that little magnet in the core makes a huge difference and to me is worth the extra expense. I save them and recycle them back to Filtec. Superior Threads also offers many options on prewounds on cardboard cores. Bottom line is one of my favorites to use. Both are polyester so no lint in either option. Finally, there is no reason you can't wind your own bobbins with the same thread you use on top or using another selection of a finer thread you can load more on the bobbin like the aforementioned bottom line or So Fine.