Allstitch if you really want the NEBS, there are other types of prewound bobbins available at Metro thread but the true NEBS are harder to find.

I get my bobbins from allstitch too. Also, they have a really good tear away stabilizer. I use the glide prewound from allstitch. My Viking works just fine with them.

Alstitch but they are close for the week on vacation. Suzanne

I don't use them, but I've also heard people speak highly of terradon.com, and they are really nice people. I think they'll even send you samples if you need them. I was going to put the link, but I lost it from my favorites. Hugs, Marji

I really like the bobbins at Metro. Here is the link. DeVon

I buy mine at Metro also and love them $19.95 per gross Love them.
http://www.metroemb.com/store/

I also use Allstitch. They sell lots of embroidery needs including blanks. I have been using them for several years with never a problem.

ttt for others to answer.

I use the plastic sided metro ones with great success. I have some NEBS from my dealer and I really don't notice any difference in stitch quality, etc.

You will find NEBS L Sized Pre wound bobbins at World Weidner but they are expensive.
See First Link.
They also sell another brand that is similar to NEBS but less expensive. They are plastic sided like the NEBS and L sized.
See second link.

Perhaps these will help you.
EastWitch2

AllStitch sells NEBS and they also have their own brand of plastic sided, L sized pre wound bobbins which are less expensive.

See links below.

ttt