Which ink does the Canon PIXMA G3270 use?

The Canon PIXMA G3270 (tank, 2023) uses GI-21BK, GI-21C, GI-21M, GI-21Y.

Compatible cartridges

CartridgeColorYieldPagesOEM priceCost/page
GI-21BK black standard6000 $13.00 0.2¢ OEM · AmazonCompatible
GI-21C cyan standard7700 $12.00 0.2¢ OEM · AmazonCompatible
GI-21M magenta standard7700 $12.00 0.2¢ OEM · AmazonCompatible
GI-21Y yellow standard7700 $12.00 0.2¢ OEM · AmazonCompatible

XL/high-yield cartridges usually cost more upfront but lower the cost-per-page — better if you print often.