LOL! PLC battery FX3U-32BL (Cobra, Sportsman, Stryker, etc) is a common coin cell battery with a cable termination soldered to it. No need to pay M&R prices. These are easily had on Amazon.
Other Mitsubishi batteries for servo, etc can be found at Mouser, Digikey, even McMaster Carr or or local electronics stores.
I appreciate M&R for certain items but they are mostly highway robbery when it comes to off the shelf parts. Quartz lamps, batteries, fasteners, SMC parts, etc.