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Steel Washer 3/8"

It is actually better to use 5/16" washers for 3/8" bolts and threaded rod.  The 3/8" rod fits through them fine but with a better tighter fit.

5/16 in. Zinc Plated Cut Washer (100-Pieces) 

Steel Washer Zinc Plated 3/8in 

https://smile.amazon.com/gp/product/B004XMY7V4/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1    $2.62 + $4.77 shipping  (buy in quantity to avoid high shipping)


 http://www.homedepot.com/p/Crown-Bolt-5-16-in-Zinc-Plated-Cut-Washer-100-Pieces-46050/203639702         $9.95 for 100    (10 cents each)