WOW!!! I've got my medical supplies catalogues here and a number 4 ambulance dressing cost £0.96. (About $1.60) Thats the standard type of dressing used here in the UK by civilian services.

If you want a seriously heavy duty dressing, for example a dressing that will stand up to a battlefield for a while, a millitary dressing costs £2.50 ($4.16).

I have treated plenty of injuries using ambulance dressings, and they've always worked well for me.

Chris