Dogfunk is free 2-day shipping. Unless you have bad credit, your credit card limit should easily handle another couple of pair of boot. You are aware that you can do partial returns (return all the boots except the Nikes and order some more - then in ship all but the best fitting boot back in the second wave). Seriously driving to the three stores that it would take to do the same thing would take more time.
2 day free shipping was not available for me when I just ordered all my stuff. Was only 7-14 days ground shipping.