Of course, it would be easier to buy Chia for $20 than to mine it yourself. But the problem is that no one sells for $20. According to https://coinmarketcap.com/ru/currencies/chia-network/markets/ right now, anyone can buy this coin using a centralized exchange at a price of $750. Although everything is possible in the cryptocurrency market, so you should wait for the Chia dump to $20.
I guess the poster must have mistaken this chia for another if there is, i was a bit confuse when he said you can buy for $20 because last time i checked the current price is at $659.33, this coin already high so those who are mining since the begining are the ones in profit, right now mining chia will not be as profitable as in the begining, i only got to know about it only yesterday from a friend, am not sure if it is worth subjecting my device for.