Audio Advisor will also let you return their Pangea cables (within a certain length of time), should you decide they provided no improvement (or worse, as stereo5 found). But they are reputed to "flag" the name of customers who return product, so don’t do it too often!
Just so you’ll know, that "75% discount" is a game AA plays. Pangea is their house brand, and they put an inflated list price on them, then mark them down drastically, making it seem like they are sale priced. It’s all illusory.