You can sell on Amazon (a few more hoops to jump through), on eBay , and on Craig's List. Of course, list what you have on ATP classifieds as well.
Sorry to be so late answering you, David Paul. Other than dividing mature, BS orchids, I don't propagate. I have to get my plants, from tiny ones to BS size ones, from commercial growers in Hawaii. Since I am now more interested in native Tillandsia (grow in S. Florida), I don't really purchase any of those hybrids any more. I don't have Harbor Freight greenhouses.