Essentially, all copied version from Taiwan are pretty much the same. However, almost all have a decoy wiring/bulb to prevent your car from detecting an error fault. So need some improvisations. And who to go to for the kit depends very much on the skill and knowledge of the installer. I was told some had their bumper damaged whilst installing the headlamp!
And yes there are many similar or almost similar headlamps in ebay, and other online websites, but it is expensive to order a single item. Furthermore, this is not something you can just plug and play. In the end, the cost adds up to what local workshops are charging now. The disadvantage of bringing in your own kit is you can't KPKB if something screwed up. So, for peace of mind, just let the pros do it.