Welp is not a word.
Sure it is. Used to express a stronger finality than just "well" which sounds girly. Power, man. In the English language, one need only say the word enough times before it gets added to some dictionary. Just look at "conversate".
Anyway, I agree with the other poster. Your order of attendance was off kilter. You should have gone to Apple FIRST, then Best Buy, then if you're really desperate, Wally World and Target.