I go to footlocker/champs sports and they sell some pretty heavy,good quality T-shirts for 5 for 20 dollars.
diggerent places different deals I am sure but its a good deal
they get soaked and when sitting in a 130 degree car for the rest of the day the ysmell really horrible.
sweat smells like pee after a while
to wash them I wash my workout clothing seperate from the rest of my clothes and I wash with baking soda on top of the soap and stuff
then I run them in another wash cycle,this time white vinegar added.
about 2 cups of eache per cycle.
and then dry on really high heat with fab. softner and they come out smellin nice.
I do this because for a while they would smell clean untill about an hour into my work out they smelled moldy again,this solved any hint of grunge there was.
I also use well water at my house so that may be the moldy smell.