Scotch
Head Chef
Check Ebay. You can find a lot of copies of the 1975 edition (there was no 1972 edition, AFAIK) for a buck and up. Right now there's one "like new" hardbound copy for $9.I hate it when my favorites go out of publishing (like the 1972 Joy of Cooking paperback) at least I inherited my mother-in-law's........
People get very confused about the editions of Joy of Cooking, some quite deliberately (e.g., EBay sellers who list a newer version as 1931, the year of the first edition). IMHO, the older versions (1975 and before) are generally better than the newer ones, although I do like the 2006 edition a lot. For more information on the various editions, go here or here.