Dear fiend,
No matter how good the PCB & PCBA supplier describes, it can be clear at a glance to directly send a drawing for quotation.
The one that you are willing to communicate with, is mostly from the price, and then is the quality and service.
If you could send us a drawing, our price cannot be guaranteed to be the lowest in your existing suppliers, but will be satisfied and even surprised
If you don't currently have a new project, how about send a drawing of previous products to me and I will give you a quotation for comparison
Best & Regds
Mr Liu