I forget what my OEM sidemarkers cost, but should be somewhere in the neighborhood of $40. I have a local guy in Houston who would do this for a six-pack and I can't imagine any local paint shop charging you more than $50. I'm not sure what John (1SLOWMK6) would charge for this, but it's much easier than having to get the color just right for the color-matching he's done for a lot of us. I'd send him a PM and ask. I know he keeps a stash of the OEM sidemarkers that you can buy from him, so that would save you on shipping.
In any event, it'll be a little more than buying smoked reflectors from OEM+ or ECS, but you know it'll be perfect. The whole point of a mod like this is to have it blend in perfectly so that it is less noticeable. A badly fitting sidemarker defeats that purpose.






