Donald Trump's claim that three states were selling gasoline at $1.99 per gallon is factually incorrect; no states had gas prices that low at the time.
Trump: Yesterday, $1.99 a gallon is two states— three states were selling gasoline at a $1.99.

FactVerify
Source: factverify.com
What the Evidence Shows
The claim that 'Yesterday, $1. 99 a gallon is two states, three states were selling gasoline at a $1. 99' is false based on multiple fact-checking sources.
Trump repeatedly asserted that several states had gas prices at or below $1. 98 or $1. 99 per gallon.
However, fact-checkers from CNN, FactCheck. Org, PolitiFact, and Newsweek have all found these claims to be inaccurate. The national average price of gasoline was over $3 per gallon, and no state had an average price below approximately $2.
60 during the relevant period. PolitiFact specifically debunked the claim that any states had gas prices at $1. 98 per gallon, calling it false.
FactCheck. Org also noted that Trump's repeated statements about gas prices hitting $1. 98 in multiple states had no factual basis.
CNN reported that Trump falsely claimed five states were at $1. 99 and later said three states were at $1. 98, both figures being inaccurate.
CNBC provided context showing the national average was around $3. 16 per gallon, far above the claimed prices.
Therefore, the claim about gas prices being as low as $1. 99 in two or three states is not supported by data and is false.