Thanks I bought Ami from you. I think the only two I need are Luna and chibi-usa now. (And outer senshi from set 2 but I'm never going to get a hold of those!)
You can try purchasing through sites like Noppin.com. It's a Japanese online shopping community where they help you bid and make purchases from Yahoo Japan auctions. There are a lot of Sailor Moon items on Yahoo Japan and most of the time you can find them for a really good deal than on ebay.
Small downside to that is the fees, which is 500 Japanese Yen per item under 4000 purchase price.