I bought these on eBay for a tire replacement I just did. They new tire a nd wheel balance just fine with the original weights, so I didn't even bother to open the envelope the beads came in.
It's two ounces, enough for 1 130/140 rear. It comes with two filtered cores in the package.
This is the seller from ebay:
http://www.ebay.com/itm/190641641338?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I think $11 shipped should handle it, but PM you location to be sure.
peace,
c W j