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Amazon [amazon.com] has 6″ DeWALT Drill Bit Holder Extension for $8.98.
Shipping is free with Prime or on $35+ orders.

Lowe’s [lowes.com] has DeWALT Drill Bit Holder Extension, Impact Ready, 6-Inch (DWA6HLDFT) for $8.98. Shipping is free for Lowe’s Rewards Members (free to join [lowes.com]).