Amazon has Ella's The Concert Years 4 CD set on sale through Newbury Comics for $14.99.
I know it's her later recordings but I've been into Ella a lot the last few weeks and $15 is ridiculous.
http://www.amazon.com/Concert-Years-Ella-Fitzgerald/dp/B000000XHT/ref=sr_1_1?s=music&ie=UTF8&qid=1363188004&sr=1-1&keywords=the+concert+years