Richard Graves - Bushcraft Books

I have some of the Richard Graves 'Bushcraft' books here and am looking to sell them on to a good home.  Those who know them know what they are and they're hard to get hold of.  If anyone knows where might be the best place to sell them, please drop me a line.  Better they are sold than sit here gathering dust and I know they were hard enough for me to find so if someone else is hunting, then bonus for them!  Cheers and thanks.