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.
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
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.
I also use Allstitch. They sell lots of embroidery needs including blanks. I have been using them for several years with never a problem.
I buy mine at Metro also and love them $19.95 per gross Love them.
http://www.metroemb.com/store/
I only but the plastic ones since my machine will not read thru the cardboard ones and tell me when thread is low.
I really like the bobbins at Metro. Here is the link. DeVon
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 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.
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.