Maps in the Mail? (Patreon)

Based on my current calculations, it would cost me roughly $6.45 plus time and effort to mail off a monthly collection of maps printed on nice 24 lb parchment, linen and 25% cotton papers (printed in rich black on ivory, copper and blue papers) to people in the US and Canada. An extra $3 or so to ship internationally. This would be a 9x12 envelope with 8 maps held between two 110lb cardstock sheets (for protection). Time and Effort are the known unknowns in this equation. I'm trying to figure out what Patreon level would be needed to unlock this service. An alternate $5 "collector" level (roughly $40 a month for a monthly map mailout - minimum contribution max of $25 / month)? A $7.50 level that combines the previous $5 level with this new service? Would there be any interest?