I finally got some out of Asus for a couple of "refurbs" I got from Newegg. It took nearly a month of repeated calls and emails to get them shipped - but I can't complain about the price. Free! So I second the idea of trying to "social engineer" some out of the mfr's. If that fails, you can get them for quite a few different models on ebay for around $8. each..
.bh.