Another option, based on Nathan's excellent reply. Note that http://www.retouchup.com
does this work at $10 per image, I've said $12 below because of the administrative overhead, which includes getting selections, sending them away, getting them back, checking them, rework, etc. This will take some time and you may like to increase that price.
Note that I actually say exactly what level of retouching is included in my packages on my website, as I've had something similar come up in the past. See below for that.
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Good afternoon Bride,
(insert some nice words, great wedding, enjoyed the day, as appropriate).
The level of retouching you've requested is not included in my packages as it's extremely labor intensive. Each image can take anywhere between 15 and 60 minutes, 400 images could take as long as two weeks full time to retouch. Because of this I outsource this work, the cost is $12 per image. I'd be happy to have (three/five/ten) images retouched at no cost, but beyond this the $12/image fee is payable in advance.
Please let me know which images you'd like retouched no charge, and which images you'd like retouched at your cost.
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My website retouching Info
The processing included in all packages is enough for most couples, it will give you great looking images that are suitable to print and display in your home. It includes color, brightness, and image-wide corrections, plus up to 10 simple blink or head fixes, where such a fix is reasonably possible. It doesn’t include complex retouching work such as removing people, removing power lines, etc, though this is sometimes done at our discretion. If additional work or retouching is requested then charges will apply. Albums will have additional image processing and per-page color matching done at no charge, but complex work may be subject to additional charges.