My suggestion is to buy your power cords used. The $100 10awg cords
might seem like a good deal now, but if you find they don't make a
difference in the sound of your system, then you will quickly want to sell
them...at a 40-50% loss. This of course, is assuming they're new at
$100/ea. The other side of the scenario is that the $100 cords are
beneficial to the sound of your system. If this is so, and if you are like
95% of audiophiles, then you will quickly sell the $100 cords to upgrade
to something better. Again, you will sell at a 40-50% loss. Just the way it
goes.
You could be in the rare 5% of audiophiles and decide the $100 cords
are perfect and you decide to keep them. If you're one of these, then I
suggest starting your own Audiophile Counseling service to help the rest
of us...and pay for your system upgrades in the process. :)