I highly doubt it. Might be about even, I dunno what the shop will charge. Its not that hard to get the rivets off...Would ddoing a notch cost more than doing a 4" rop in the rear, since the shop would have to grind the rivets off of the hangers to do a 4" drop?
why not do it yourself in your drive way?whats the price difference of having a shop do a 2/4 over a 3/5 or 3/6? i wont have too much money after wheels and tires