this morning i opened my email and got this felicitous message: "You've made a sale--Please ship your item."
i'm not auctioning anything on ebay; this is even easier. i posted books for sale at Half.com, and every now and then, (especially at the start of a new college semester), someone orders one and i ship it out. to post a book, all you need to do is type in the ISBN number, and the title, picture, edition, along with what it is selling for all come up automatically, and you can decide what price you will sell yours for. (if the market is flooded and other copies of my book are selling too cheaply, i'll usually elect to either keep my copy or give it away.)
i make the most money on the paperbacks i read as a religion/history major back in college. i graduated almost seven years ago, so textbooks would be obsolete, but these clearly are still being assigned. i've sold non-academic books, too.
i ship the books via Media Mail, and even the postage is reimbursed. (the shipping allowance is $2.64 for paperbacks and $3.07 for hardbacks, and you can also sell cds, dvds and games.) the money gets deposited into my bank account once a month.
making money selling books on Half.com works for me.