What were the initial size estimates you all wanted these to be at? Erikstormtrooper mentioned 5" width height would be about 3" high. We need to test out carstickers.com, to see how they turn out and how long it takes. [website says 3 days + 2-9 days shipping] Anyone into placing an order?
So looking at these options, made some .ai files which can be used with the order:
link: http://www.carstickers.com/Create_A_Cut-Out_Decal_With_Your_Image_or_Logo.php
5"x5" - (do not send the .png) = $9.00
.ai file: http://noneinc.com/SSW/4_carstickers.com/SSWc-Logo_4carstickerscom-5x5_3.ai
8"x4.5" - (do not send the .png) = $10.50
.ai files: http://noneinc.com/SSW/4_carstickers.com/SSWc-Logo_4carstickerscom-8x45_3.ai
If you'd like a specific size, post what you'd like or take the .ai and modify as needed. The small ones on both sheet might be 'too' small. Don't know how their paper and cutting mechanisms work. (assuming laser cut, so then it's how easy is it to remove and paste.) The .com part is going to be a pain in all versions most likely. I wouldn't order more then one the first time, not sure what to expect.
The cafe press "4 mil vinyl" options are either 3"x5" or 10"x3".