Cool & new (to me) spins!
I'm guessing most people have some if not all of the That'll Flat Git It series from Bear family. I also like two CDs of western Canadian '50s rock they put out 'Les Vogt & The Prowlers' and 'Real Gone Aragon', but I'm probably biased, always such thick booklets and you find out folkie Ian Tyson started out in a Vancouver R&B group on Aragon label!
Glen Glenn got to hang out with Elvis and his band back in the heyday, saw a bunch of his personal photos in a great book titled The Blue Moon Boys. The new Elvis Complete Louisiana Hayride combo book/CD
http://www.memphisrecordingservice.com/ is really worth getting sounding better than previous editions with what has been around before and adding some new discoveries, the very first Elvis appearance on Hayride from 1954 is fantastic quality!
I've picked up some vintage Bill Haley Decca EPs and singles when I've run across them because they sound good to me and seem to be dirt cheap usually, but they're not so much rockabilly as white guys doing the Louis Jordan and Big Joe Turner 'jump blues' thing, lots of stand-up bass slapping however.