I buy mine at All Stitch. Just google all stitch and they are $19.95 for 100 bobbins. I have 3 girlfriends and they all have different machines and they all work. We all use cardboard side L.

I have two brother machines.. have had no trouble with the brand. one for sewing, one for embrodery and does sew as well, but use it for embroidery.

I buy the embroidery bobbin thread.. but wind my own each time. will be watching.. so far this works topsy for me.

Ell

Amazon.com is a good place to compare prices.