I just did a search on Amazon for Rumpl Down Blanket and if you scroll down a little bit you will several blankets that look comparable to the Rumple possibly even larger ones that dont have that name brand issue for $60-80. I have included a link to one of them below that you can get for $65 after you clip the coupon. There are quite a few of them on there though.
I really only use REI for sales anymore. The used side is cool too.