PCBA2Z states that it works with multiple third-party fabrication and assembly vendors and helps customers compare quality, cost, timing and capability.

The current fabrication page says PCBA2Z acts as the technical intermediary between customers and selected manufacturing partners, including support for flex board manufacturers.
Identify potential suppliers.
Check capability and references.
Compare quality / cost.
Review supplier output.
Choose the best-fit vendor.
Coordinate fab / assembly.
Single, double, multilayer or flex.
Prototype, pilot or production volume.
Gerber, BOM, drawings or source files.
Required delivery date and destination.
This demo is ready for a real payment gateway/API connection.