Because of my plantar fasciitis, I only buy Eccos. They retail for $100 or more but I know my size and often buy slightly used on ebay or other Internet deals and save a lot of money. I keep several in rotation and wear them out from the inside (you couldn’t tell by the outers or the soles) in six months to a year. I have noticed their quality seems to have gone down over the last year or so. I might be looking for another brand.
Take care of your feet. Having sorel feet can be physically and mentally/emotionally debilitating. I have some remedies for sore feet if you are interested. Good luck!