The left chest logo has the 1st Battalion, 5th Marines unit logo in black. The full back logo has the same 1/5 unit logo.
Any shirts with a price tag of $7 is real. The $7 is just for the shipping cost of that item. It's not the price of the shirt. The price of the shirt is $0. I can't charge shipping on some items and not others. The site isn't set up that way. If you don't want to pay for the shipping, just drive down to SC and pick them up for free.