IMO - your overreacting. It's the holidays, weather has been bad in some areas, and mail is moving slower than normal (i.e. USPS being closed and heavy time of year for postage).
However, it does seem like the people you are purchasing from could give you better communication.
Currently looking for the following comic Books:
United Comics: 21,22,23,24,26
Tip Top: 173 & 184
Peanuts 1 (1953)
Peanuts: 1-4 (1963-64)