There are some amazing graf books (twister, espo, wufc, underground files) and mags (old xplicit grafixx, bombers, old graphotism, garage mag, UP, New York old school mags) on ebay right here:
http://www.ebay.co.uk/sch/willsomeonehavethoughtofthis/m.html?_nkw=&_armrs=1&_ipg=&_from=