post-free

From post +‎ -free.

post-free (not comparable)

1. (British) Supplied by post (mail) to a customer without an additional charge for postage.
   • 1963 March, “Small advertisements”, in Modern Railways, unnumbered page:

     All in attractive folders—5/6 per set, post free.

• “post-free”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.