They are fairly regular on eBay, both new/nos and vintage. You can get them new/nos from teds vintage watches or watchco for around $300. I snagged one BIN for just less than half that last week
Yeah I found that some sellers don't use the term "beads of rice" or "BOR" because they aren't WIS and don't know the bracelet by those terms. I found mine listed as "Vintage Omega Bracelet"