Just a heads up for anyone in the same boat as I was and wanting to know the outcome.
I emailed what seemed to be the company owning or at least operating the designspin website asking for some clarification on the designspin web sites' security status, and if it was indeed a working web shop - I received no reply. I also tried to call them, but could not get an answer to a call.
Needless to say I got very cold feet about inputting a credit card number into the designspin website and went elsewhere for the required art;
http://www.tshirtartworks.com.
I was a little hesitant again as this site just asks for cash to be sent to an email addy, however after biting the bullet (we are on a tight deadline), Eddie emailed me back within a few hours and later that night sent the artwork we purchased.