Try eBay for used car parts people. (I loved my Soul.)

 

Could be worth asking a breakers whether they have a good one in the right colour. It’s normal to get bits and have to paint them. Modern mirrors are expensive.

 

if everything works and it’s just a broken mirror glass they are taking the piss, have a look in Halfords as they have all sorts of sizes of replacements mirror glass, if that fails there must be specialists that can make a copy and then just stick it on over the original glass.

 

Don't forget the glass has a built-in heating element, which may be broken, so a stick-on replacement would not be heated.

This may do the trick. If it's the wrong colour, you could probably just swap the plastic shell.

 

It also has the cutout for the lane overtake warning on the mirror

 

From what you have been told a replacement glass only should be available from Kia. It is worth trying that first. Before you order take the old glass out and have a look to see if there is indeed any damage that would prevent just a glass being fitted. It’s quite common for door mirror bodies to come unpainted. If you need the complete assembly it’s worth finding out how much that is pre-paint. You’ll find the sealer will charge the earth to get it painted. It might be much cheaper getting it painted yourself.

 

OK thanks all. Sorry for delayed reply but been away for a while. Luckily, I have found an auto salvor in Bolton breaking a Soul EV FE, so now waiting for a nearly new NS door mirror to arrive and will then get it fitted by local Kia dealer Brayleys Oxford.
Originally, they told me that it is possible to replace the mirror glass only and that would be about 30 quid. However, when they go to see the car, they decided a new glass was not going to work and the only proper fix was a whole new unit, which come unpainted - and as Cocijo points out, it's the painting that costs the most. Now hoping to get the job done and good as new for about 250 quid, which is a lot better than 600+

 

So, the mirror arrived this morning. Called Brayleys to arrange fitting. No answer so left a message. They did not call back – and still haven’t.
In the meantime, thanks to an item on the “Youcanic” channel on You Tube, I decided to have a go at fitting it myself. A bit of care required to avoid dropping any bolts down the back of the door card, but 20 minutes and the job’s a good ‘un. Power fold, power adjustment, indicator and blind spot all working fine. I assume therefore the heating will do too. So a potentially £650 job became a £200 one – result! Very satisfying and if anyone else suffers the same issue/incident, I can highly recommend this route. Just need to be lucky enough to find the right part on the used or aftermarket.