just throwing this out there; just about every shop out there will do tint below the legal limit for $$ under the table and just about every shop out there would really hate to see their names on threads like this.
While it may not seem like that big a deal (and it really isnt), shops can get fined a tremendous amount for doing this. For one, its tax evasion, and second, shops can see a fine of $10,000 if caught tinting below the legal limit. Its also been documented that a tint shop owner has seen criminal penalties after a vehicle that they tinted the windshield on (like 5%) was in a wreck and they were held liable. This goes the same for asking your shop to bypass your ebrake lockout on an indash screen.