There's a world of manufacturing options out there, literally. Since the outsourced manufacturing boom of the 90s-00s, the only challenge facing a company looking for assembly electronic solutions is sorting through the many, many options on the table.
For a lot of companies, the options boil down to "who has the lowest prices?" but that's really only the start of the matter. Sure, there are plenty of assembly plants that will provide what you ask for, more or less, but you can ultimately get far more out of your assembly service without paying too much more money.