Courtesy of Dragonmaiden the latest cd to be added to my collection is Axel Rudi Pell's Knights Live - It's very nice!
For NWOBHM stuff I tend to get it on Ebay. I was too young to properly appreciate that era but I think my fave bands from that time (Apart from the obvious Maiden, Def Leppard and Saxon) were Witchfinder General, Trespass, Tygers Of Pan Tang, Diamond Head and Praying Mantis.
There's some fairly good info on these bands at
www.nwobhm.com