So:
If you get yourself up to the Katharine Susannah Prichard Writers Centre for the KSPSF Minicon today, you'll have the opportunity to buy a copy of The Corpse-Rat King at the launch price of $15 instead of the retail price of $17.95 and you'll get the code for 25% off the e-book price through the Angry Robot website.
And if you don't, you won't.
Easy decision, innit?