In a hot deal, B&H Photo Video is discounting the Canon Drop-In Filter Mount Adapter EF-EOS R (Circular Polarizer) to only $149.00, which is 50%-off the regular price of $299 for this mount adapter!
Hot, B&H: EF-EOS R Drop-in Filter (CP) Mount Adapter $149 (50%-Off)
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Looks like this deal is available at many stores, including Canon’s official store.
I remember when they screwed up and switched the price of the basic adapter with the CP drop in adapter. Got it for 99 bucks!