Re: X5 front and rear bumper
Haven't done the front yet, but I did the rear. It was about $450USD for paint and install, $350 in parts (including bumper and all related install parts).
Front - I'd estimate $250-$350 per fender, $250 for front bumper, you'll need the fog lights, likely need the front bumper carrier as well, I think you'll also need the inner fender splash guard (not 100%), and smaller clips and parts depending on what came with your bumper. I'd estimate $1k to $2k on paint and install. All prices are in USD.