If you have glass cover on your insurance you might be better off claiming. Glass claims usually don't count as claims that need to be declared and don't affect NCD, but check with your insurer obviously.
These are £200+ new and need to be cut out and glued in place like a windscreen or rear hatch glass. For this reason there's rarely any used ones for sale on eBay, etc.
There's 2 versions, a light green and dark green (called green and black). It looks like you have the dark version but it never hurts to check.
The light one is 1P0845042A 5AP and the dark one is 1P0845042C 5AP as previously posted.
For the sake of completeness and making the thread useful for others who may find it, for the left side part numbers substitute the 2 towards the end of the part numbers for a 1.