I would use replacements.com only as a last resort; they are outrageously overpriced. I have had the best success replacing china looking for pieces on eBay.
Everybody seems to be offering you ways to replace a piece or two.
Usually I see whole sets of dishes sold on Craigslist. Might be an idea to take some time to search through many areas and also post a 'I'm looking for this set' advertisement. Although I'm not a facebook person, I hear they also have facebook yardsales.
I had already checked replacements.com and ebay. Both were crazy prices! I got 5 plates and 8 bowls at goodwill for $1 a piece. I'd rather just go by some white plates or something that I can mix and match with these. If I happen to find more somewhere along the line then that'll be nice but I won't be devastated if I don't.