Don't offer me a discount AFTER I ordered it

<START_RANT> Last night I ordered two spools of filament. This morning I get an email that says “We see you were interested in this” and offering a discounted price on one of the spools I ordered. Really? </END_RANT>

A email to customer service will likely get you the discount credited. I have done this several times with success (3DPrint wasn’t one I had to contact)

Yeah shoot us an email and we can see what we can do for you!

Yes. They gave me a gift card for a little more than the discount I missed. Turns out that Standard PLA went on sale this morning.