PURCHASE A SHIRT FROM THEM! I have bought only two things from 6 dollar shirts but they both have delivered quite well. I purchased their black "Pixelators"
( http://6dollarshirts.com/product.php?productid=12148) and their "Who's your Doctor?" tee
I have talked with people who run the website and business and they're a small business that writes all their emails, do all their advertising, make all their shirts, and pretty much anything else. They specialize in sunglasses, hoodies, trucker hats, t-shirts (obviously), bumper stickers, phone cases, and pocket tees. They come out with a new shirt almost everyday.
Like the name of the website, they sell their tees for $6. Sunglasses, depending on what type, are typically around $5. You're able to purchase a random pair of sunglasses $2.25 and random tees for $2.95. Say you aren't wild about the website but a friend or family member is, they have the option for you to purchase a gift certificate to give to your friends or family.
Over all: I'm highly satisfied.
The people who run the website and business are genuine and real. Not an algorithmic, big rig machine website. I love it and I personally prefer it over any Frank & Oak type website.