Yes, I am dedicated an entire post to coasters. No, I am not obsessively neat. I have actually never owned tables that were worthy of protection (the last coffee table had the initials of my roommate’s brother carved into the side) but since nearly every store that sells home goods has coasters, I assume there is a market.
12fifteen has hand letterpressed coasters (done on heavy coaster stock) sold in packs of 8 for $12.00. My favorite designs:

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