In reply to Elsier:
The reason they want to paint it is because it's damn near impossible to get a colour match otherwise - the paint on your car will have subtly aged, and every car can be a bit different depending on where it's been parked, sun exposure etc. To do a really good job, you have to also paint a little bit onto the adjacent panels, and blend it in gradually. Because of that, most new bumpers will come primed but not painted.
The fact they're keen to paint it and the suggested bill sounds like they are offering to get it looking like new. Lots of body shops work that way, as it is what car enthusiasts and insurance companies want. If you don't care about looks, it should be possible to do it much, much cheaper.
If the car is common and not too new, see about getting a replacement in a close-enough colour from a scrap yard. Depending how it is attached, your local garage might be willing to swap it, as it's a different thing from trying to repair it and much more like what they are used to.
The cheap and nasty way would be to take a hot soldering iron and melt a line of holes about 30mm apart 20mm back from each side of the tear, and join it up with garden wire or zip ties. To pass muster at the next MOT, you need to do it so that the're nothing loose or about to break off, and there's no sticky out bits which could catch on a pedestrian in a crash. Best to get the joins in the wire/ties on the inside if you can, but it depends where it is.
Can't really suggest anyone to do that. I'd just do it myself, but I suspect my usual garage would do it after a bit of grumbling if I asked nicely.
Post edited at 19:27