I use the socket savers from TubeMonger:
I tried cheap ones from E-bay but I like the TubeMonger ones best. And, since you are thinking of socket savers, you might want to consider dampers:
+1 Tubemonger socket savers - excellent. I use both Noval and Octal ones and they make tube rolling much easier. Almost a required accessory for the Lyr, but very beneficial with other amps too.
+1 Herbie's tube dampeners (I like the Rx version with the soft grommets).