Some are, some are not.. if you have a specific pharmacy in question ask about it in #otherdrugs on the bluelight chat server...
As a general rule - many of the places that sell nothing but benzos or codeine are legit and your only risk is having customs snag it.. if they sell anything like oxycodone, morphine, or even hydrocodone (in amounts larger then like 2mg per pill) then it's most likely a scam .. still, we don't allow any sources to be named here and I have a feeling if I leave this open someone is gunna slip and post some online pharmacies..