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Grey Market dealer quickndone via eBay has the Canon BG-E22 Battery Grip (EOS R) for $139.99. This is the lowest price seen yet for this grip! They are not an authorized dealer, so this is grey market and a Canon USA warranty is not guaranteed. Only four battery grips are in-stock.
Also consider our street price of $1649 for an EOS R with a free BG-E22 battery grip, brand new from an authorized Canon dealer — which has a 1-year Canon USA warranty.