Went to my grandparents' thrift store the other weekend and brought back two Trixies and a Ginny Gordon book. In case you don't already know, Ginny Gordon was a mystery series written by Julie Campbell during the same time as Trixie. They're deucedly hard to find nowadays, too. More about Ginny later.
So anyway, I got away with the Mystery In Arizona (Cameo edition, my favorite) and the Mystery of the Emeralds (deluxe edition) and the Mystery in the Old Barn (Ginny Gordon). There were an absolute TON of Trixie books there, I wish I could have gotten them all! Mostly deluxe editions, but a couple of the first edition-style ones as well....if only I had the money *sigh*.