I also bought the $11 blanket from Harbor Freight.
Specs on this blanket:
About 60" x 80", 80% wool,
HF item 92625; much thinner than the Ohio Prep Supply blanket, but then I just bought the HF blanket as an emergency blanket for the car.
This blanket comes with a strong odor, and I don't think the odor is wool. It smells like Harbor Freight when you walk into the store.
Besides use as an emergency blanket in the car, I think these might have some value as a barter item in case of an economic collapse, although chances for that got postponed for at least four years back in November.
I did manage to get the bad odor out, though, now it just smells like wool. I washed the blanket three times with Woolite. You should use the 'delicate' cycle to reduce agitation that might stretch the blanket (or wash it in a tub). Next I ran it through the dryer in the 'air dry' mode, but that step was probably not necessary because my last step was to hang it out in the sun and breeze for two days. I think that is the most important step, even if you don't wash it. The blanket gets much thicker after all this in my experience, which actually isn't a good thing for storing in a car but maybe it makes it warmer.
I think I'll keep an eye on Harbor Freight ads and if they have them on sale I might get a few more.