Discount code for Rock Auto Parts

I just did a search for a Spectra part number & came up with a site called frugalmechanic.com There was a link to the part through Rock Auto and an offer of a 5% discount. I clicked the "view details" link & it gave me a number code that would give me the discount. I just cut & pasted the it in the "How did you here about us" box & it gave me the discount. Here's the code I used.

40853913363949

There were also discounts for Parts Train, Auto Zone, Advance Auto, & a few others.

They might be computer generated somehow or changed automatically, but it's worth the short amount of time it took to find.