I've only bought Red Box from CMON too, they came blistered but I get plenty of stuff in ziplocs from other companies, eg. Hasslefree and Heresy, but they're then bubblewrapped and boxed. I once had a ziploc of 3 minis show up slopping around in an unpadded A4 envelope (from a omb who I shan't name) though! Amazed they arrived intact.
I basicly think of a blister as Retail packaging, if I'm buying direct I don't expect them. Plus they just go in the bin so are wasted, I get enough plastic food packaging for scratch building or glue-mixing to not need them.
I will just mention the Otherworld packaging though, big clamshell blisters (resealable) with a fat wodge of foam in them, best packaging I've experienced from a smaller mini company.
Cheers, B.