So after checking out Susan's links, I realized I needed to speed up some of my sales as well. I've just posted a few of my former grails on Ebay. I've had some success with The Doll Show & Sell Marketplace, but there's no incentive for buyers to follow through with their transactions.
If you're interested, check out my new auction listings here. I have a bunch of pre-orders that are being released in May and June (along with our first mortgage payment), and my timing couldn't be better!