Like dan s said, this website is very obviously a chinese knckoff market. If you are expecting a high quality tshirt and good customer service when you are paying 70cents, the problem lies with your judgement.
They do indeed over charge for shipping, but it isn't that much more than anywhere else over charges.
I placed a small ($30) order with them in october 2011 and it arrived in march 2012 (this was outside the 1-3month timeline, but for $30 and this many clothes, I didn't mind. ($30 is not even 1 pair of jeans in the uk.)). Every item was wearable, not terrible quality either to be honest. It is now february 2013 and I still wear the clothes I got there, a button came off something... but buttons come off anything if you tug hard enough.
Ordering from this site is definitely a gamble, and I see now they have a new warehouse in the US, but items there cost a bit more than I remember from china.
I was thinking of ordering some free boots since I got $5 for confirming my email on their site and $18 for posting a 31 second youtube video. I haven't tried yet, so maybe their credit doesn't cover shipping. But if it does and everyone can get $23 for very little effort - give it a try!
Tl; dr - chinese knockoff website, cheap prices = not the best quality. Expect huge communication problems. Ordering here will ALWAYS be a gamble.