Are you dealing with one issue or two, i.e, cold feet or cold cracked feet? If it's just cold feet, you can make yourself a 'corn bag" and it won't cost anymore than the cost of the dried corn.
I use leftover denim and pop the corn off the dried ears I buy for the squirrels. Just sew yourself up a bag, put the corn in, close up the 4th side, voila, you're done. Pop in the microwave for 1-2 minutes and you've got the most wonderful warm bag you can use for your hands, feet, neck, back, where ever. We heat 'em up and put them in the cold bed, deliciously warm on your feet!
Both...my feet are pretty good right now, as far as the cracked heel issue...I've got it under control.
But this ache...oh my word...this just started last year and only happens when it's cold outside...I went all summer with nary a twinge.
Now my feet just ache ALL OVER! They feel like two big chunks of aching ice stuck to the bottom of my legs!
I have rice and wheat and popcorn and since this morning, I've read you can use all three. I would think the rice would be easiest to make an insert out of and slip into my house shoes so I can walk around.