Iamsuperhero.com has DC and Marvel-themed gym clothing (like Under Armour) for $21.25 after code "15OFF" with free shipping.
Popular characters like Batman, Superman, Wonderwoman, Deadpool, Iron Man, Captain America, etc are available. Be sure to follow their size guide closely.
I usually wear a Large shirt, and ordered a 2XL Punisher short-sleeve shirt based on chest size. Fits perfectly and wicks away sweat.
Shipping takes about 10 days since the product is coming from overseas. I ordered one as an experiment and everything seems good, so going to order more.
Compare to Under Armour Alter Ego series: https://www.underarmour.com/en-us...ego/g/31ah