Extract it: http://www.erowid.org/chemicals/dxm/...y.shtml#toc.11

Get some capsules at GNC or Health food stores and make your own. You can approximate how much extract dxm you got depending on how many bottles you used and from there eyeballing 500+mg of powder shouldn't be too difficult. (Also note the capsules will only hold a certain amount of powder depending on their size.)

This could be cheaper than having to buy it and wonder if the website you ordered from is screwing you.