You are focusing on spending money on something that you really do not need. Warm towels for 6 getting out of the spa in the winter, are you a politician in Washington, or a head of State? $2,000 for warm towels, I doubt if anyone here would spend $200.
Just a suggestion, but how about using a cooler. Towels and robes stay warm, dry and free of snow accumulation. You probably already own a cooler that can be used and you have accomplished your objective. If you put a "warm source" in the cooler, that is even better.