Amazon.com has Add-On Item: 6-Piece DeWALT Metal/Woodcutting Reciprocating Saw Blade Set (DW4856) on sale for $6.00. Cheapest according to CCC. Shipping is free w/ minimum orders of $25+ (qualifying items shipped and sold by Amazon).
Note, this is an add-on item. Shipping with any qualifying orders over $25.
https://www.amazon.com/DEWALT-DW4…alt+blade
Previous FP deal at $7.99: