Falcon Dust-Off Professional Electronics Compressed Air Duster, 12 Oz Cans, 6 pack, $14.19 Costco B&M Item# 246143
$17.69- $3.50 instant coupon= $14.19
It's a large quanity, but it's easy to pay the same price for 2 or 3 cans at other places. Note that many of these duster products come in 7 or 10 ounce cans, not 12oz as available here. Compare at Amazon @ $34.99 for the smaller 10oz. cans.
Also available is a 4 can package at SAM's Club for the same price per ounce:
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