Sears offers the Craftsman 3/8" 4-Piece Extension Bar Set, model no. 43282, for $8.45. Opt for free in-store pickup to dodge the $6.50 shipping charge. That's $2 under our February mention and the lowest price we've seen. (It's also a current price low for a shipped set by $13.) This set includes 3/8" drive extenders in 1-1/2", 3", 6", and 10" lengths.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.