Ideal Electrical 1lb Duct Seal Block $4.92 at Amazon $4.92 $11 Temporarily out of stock. Amazon has the Ideal Electrical 1lb Duct Seal Block (31-601) for $4.92 with free shipping on $35+ or with Prime. $4.92 retail: $11 Posted by VanGogh10/30/2024 at 10:02 AM PT