NEW YORK (TheStreet) -- Low gas prices have helped sales to accelerate at Dollar General (DG - Get Report) , TheStreet's Jim Cramer said during CNBC's "Stop Trading" segment. Having a analyst resume coverage on the stock helps, too.

Cramer, the co-manager of the Action Alerts PLUS portfolio, said J.P. Morgan resumed its coverage on the AAP holding with an overweight rating and $85 price target. Dollar General hit a new 52-week high on Monday but now trades at $71.50. 

DG Chart
Dollar General DG data by YCharts

Looking at other stocks on the move, Cramer noted Valeant Pharmaceuticals (VRX  shares are up over 13% Monday thanks to its announcement of buying Salix Pharmaceuticals (SLXP for $10.1 billion in cash. 

If Valeant can generate $11 in earnings per share and is valued at 20 times earnings, that puts the stock at $220, Cramer explained. If the company does indeed earn that much, the stock is cheap even after Monday's rally, he reasoned. 

-- Written by Bret Kenwell

Follow @BretKenwell

At the time of publication, Cramer's Action Alerts PLUS had a position in Dollar General.