I've used JLC for PCBA. They use LCSC for parts, and have a separate inventory. You can only get parts that LCSC stock assembled, which is a pain - I ordered an

I've used JLC for PCBA. They use LCSC for parts, and have a separate inventory. You can only get parts that LCSC stock assembled, which is a pain - I ordered and soldered a QFP-144 part myself because it's not in their list. But A$120 got me two partially assembled boards, in a few weeks, which isn't terrible at all. (I used EasyEDA for this design, to get better access to JLC's parts catalogue, but it was a worse overall experience than using KiCAD, and I still had to fix up some parts' rotation anyway.)