I had the same thought but there seem to be tons on ebay for $49 with free shipping (and only a few successfully completed sales). I'm guessing you could get perhaps $25-$30 net (or you might get lucky and get more).
So, with work, you might net it out at $60 which is a pretty good price. Looked up the DIR-815 but it doesn't look like there is any DD-WRT support.
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