I need some help interpreting the Sign Contractors Pricing Guide for vinyl letters. First thing I notice is there are two sections for vinyl letters, Sign Writers and Computer Graphics, and they are not the same price, $1.45 vs $1.30, though both are computer generated. Which do I use? Next, my caps are 3" and the small letters are 1.5". Do I figure the letter height on the capital letters, or individual letters? For premium vinyl 3" letters the price in the guide is $1.45 ea. My total for 3" 158 letters is coming in at $205.40 using the $1.30 price. Does this sound right? Many internet sites are pricing at about 1/2 this price. Thanks!