Not GP, and I’m in a totally different country than the GP, but I’d be willing to pay USD 2 a month for a duo plan. I’d be willing to pay on an annual basis too, since small monthly payments usually incur higher processing fees (percentage wise) for the seller. Just for comparison, this amount would be equivalent to a Spotify Premium Duo subscription (with its regional pricing).

I'd pay the price of a coffee, would gladly give up one cup a month for this. That's about the equivalent of $2.50