I have a pretty severe case of Raynaud's disease (a disorder in which your extremeties don't get enough blood flow when cold), and my doctor recently encouraged me to purchase a few pairs of UGG boots, as they apparently mold to your feet in the proper way to keep warmth to your toes. Only one problem: UGGs are insanely expensive (for me at least). I own other brands of shearling boots, but none of them seem to help my disorder when I get cold. Are UGGs truly that different from other brands, and if so, does anyone know where I can get some (maybe used) for cheap? I don't have more than 20-30 dollars to spend on them.