Hmm, from what point? The book pages themselves show only the sale price right now. (To take my own book as an example, the eBook is normally $18 but currently shows as $10.80: http://pragprog.com/titles/tbcoffee/coffeescript) When you add it to your cart, both the full price ($18) and the discount ($7.20) are shown.
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[ 3.3 ms ] story [ 32.4 ms ] threadat PragProg w/40% off: $29.97 at Amazon: $28.82
Not sure about shipping costs at PragProg, but on Amazon the book qualifies for Prime shipping.
http://pragprog.com/titles/tbcoffee/coffeescript
http://pragprog.com/titles/rcctr/continuous-testing