This caught my eye... And then I remembered that my safaribooksonline subscription lets me read all the o'reilly books I want, and thousands of other tech books

This caught my eye... And then I remembered that my safaribooksonline subscription lets me read all the o'reilly books I want, and thousands of other tech books, for $20.00 a month. For anyone who wants to use this coupon, I'm not sure why you wouldn't just get yourself a month on safari... or a free trial for that matter.... Any ideas?