Save on the revolutionary, new Moen M-Core valves here at PlumbersStock. Make sure you get the right configuration for your installation. First of all, you need to figure out if you're doing a tub/shower install or a shower only. The valves also differ in terms of connection type, whether or not they are prefab, or come with stops. As Moen describes it:
The M-CORE system features an integrated mounting bracket that secures the valve directly to a brace, streamlining the installation process. It offers a quicker temperature limit stop adjustment process, and the integrated test plug allows installers to easily flush and test the system without having to remove or install the cartridge. M-CORE mixing and transfer valves also are available in several inlet and outlet plumbing options to meet the needs of installers.