Popular Photocards

I gave one of my handmade photocards to a local entrepreneur a few weeks ago, taken in her garden by the sea. She recently bought a large portable card stand at a car boot fair and asked whether I am interested in selling my cards when she does summer pop-up garage sales.  I used to have an outlet at Whitstable Information Centre before it closed and am considering whether it’s a viable option or to just carry on selling them at exhibitions?