I was researching these recently for various vendors, and 120 inch rounds, at the cheapest places I could find were $12 each to rent. I was just on the Budget board and someone was talking about a deal on ebay. I checked the ebay link, then searched for he company on google. I found them for cheaper there ($8.69 each, several colors) than she was saying the ebay seller sold for, and LOTS cheaper than my rental searches.
10 black round table clothes, 120 inches, plus $6.95 shipping, total $93.85. Less than rental. Of course I'll have to sell these after the wedding, LOL.
They have other sizes too. I think it's just the round ones on sale.
https://www.chaircoverfactory.com/