theses not much money in matchbooks lately, you cant send a full or partial book without damaging it unless its sent in a small box or possibly a bubble envelope, it will crush and not be the same, they are fragile, i also would not unfold a matchbook over 50 years old, they are brittle, plus some collectors prefer them with matches, so with shipping at 2.66 before fees, not much money to be had with few exceptions.. as far as flammable? thats for self striking matches not safety matches which are i believe ok per my usps friend..