i'm sure i could put 5 dermasafe razorblades in an envelope and mail it to Bozeman for a dollar. i might even try it just for fun.
as far as ranting about carbon footprints and waste, i don't see much validity in that. it should just be a simple A10 paper envelope with 5 blades in it, just like the other billion pieces of mail going around the US every day. i've received little bits of kit from people (shires, mldgear, etc.) in A10 envelopes in the past, sent regular mail, not priority. most everything we do in modern life is wasteful, environmentally damaging, etc. this doesn't seem like a particularly good one to single out.
however, perhaps it's irresponsible to sell disposable, non-biodegradable, plastic stuff in the first place! it's probably shipped from china too!