Steak from the Street

I like good steak.  I cook steak on the grill often.  I cook all the way from a flat iron cheap steak to a porterhouse steak.  There is not a steak that I won't cook.

I cook them simple with just seasoning and charcoal or if I am in a hurry I cook them over gas grill.  I sometimes marinade them but mostly not.  How do you cook your steak?

What I want to know is whether or not the street vendor that came down the street almost peddling steaks like an ice cream truck has good steaks or whether they are junk steaks.  I package of good steaks was supposed to be $25.   My fear is the quality.  Sounds like a great price.

Anyone out there ever bought from one of these guys?