No sales in May 2019, but one poster sale in April 2019 to the United States:
Stained Glass Santa Monica Pier Poster by Christine aka stine1 on Spreadshirt
This is my first poster sale on any Spreadshirt site – well, not that I had many sales on Spreadshirt anyway…
Zizzling Zazzle - Christine aka stine1 designing print-on-demand gifts 