So I found out that you CAN run sales on Etsy. Lyz bought some items over the weekend, and the seller puts either on their front page or the listings, not to pay right away. Then the seller adjusts the invoice. So you can offer a discount or a buy one, get one free promotion.
Which is good - because now I don't have to do the "free gift" idea (which I 'm sure really wouldn't thrill anyone) for our annual holiday sale.