How many times have you logged on and typed in "Chalet School Elinor Brent Dyer" in the search engine? Lots and lots, don't worry, we are all in the same boat. I've been a fan since high school and discovered that the best way is to get a complete listing of what you have already in the series then you are able to type in the name of the book, you are after. Don't forget that there are international sellers too, so please check there as well, sometimes unexpected surprises show up this way. My only downfall is the p/h so don't forget to go to the post office and check the postal rates there as well. This will help you to decide whether you are able to chase that particular book, you're after or not.
1. Access all available information on your subject.
2. Get a complete list of all items that you are after (often there are several printings of the same book).
3. Check out postal rates.
4. Ask the Seller questions. They are there to help you.
5. Check out all the prices available. Often there is 2++ sellers selling the same item but they may have different prices.