Plenty of TRICARE users will be switching to mail-order for their regular, daily drugs over the next few months thanks to a rule change. That switch requires non-active duty and non-overseas users to buy name-brand maintenance medication through the mail-order system or pick them up (for free) at the MTF. If you don't live near an MTF, mail-order is going to be your only option. The time to figure out how to use it is now. For a walk-through of the process, see this Spousebuzz article.