Jim Ward, the designer of Metamorphosis Alpha and many other early TSR works, is facing huge medical bills. The Greyhawk Grognard has a full report. It would help if you can take a look at his RPGNow store and see if there is anything there you like and buy. I particularly recommend the original Metamorphsis Alpha as a fascinating look at Gamma World's progenitor.
To me the Old School Renaissance is not about playing a particular set of rules in a particular way, the dungeon crawl. It is about going back to the roots of our hobby and seeing what we could do differently. What avenues were not explored because of the commercial and personal interests of the game designers of the time.