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Shipping adds $7.
Right at $73 shipped with the blade, tube, spring, and buffer is probably not that bad a price. I didn't order it since I still have 5 or 6 I ordered black Friday.
This is the cheapest today. They have been cheaper in the past. If you don't already have one I'd buy.
https://outdoorsportsusa.com/AR-15-Overmold-Ambidextrous-Shockwave-Lower-Build-Kit
Here is a whole lower build kit for $99.99 and free shipping