www.taobao.com, but I think you can't buy there. Try Aliexpress.Website it actually looks good ha
I have the silver ones. And though they look nice, they dont stick down evenly. The back part sticks up a little. I even tried better double sided tape.In China there is an overlay kit with several colors available, one of them is piano black. It is easier because i think the trim can only be removed from the back of the door panel. You can cover the whole interior if you like, including armrests, center console, gear knob...
I would try removing them & shooting them black with something like Krylon fusion paint, the door handle itself may be tricky though because it's such a high wear item.. (it may wear off or chip over use, even with a wrap it'll probably peal)The silver part and and door handle would it look good in black and if so do you guys just wrap it or you can remove it thanks