A bit convoluted, but you should be able to knock $75 off of a new K3... or any equipment that's in excess of $375 with the following via Slickdeals. As we don't link there, the TLDR version:

Deal Instructions:
Login to or sign up for your PayPal account
Go to the PayPal Offers page
On the large banner under "Deals and offers", use the side-scrolling arrow button on the right side of the banner to browse through your available deals. Look for the B&H offer for "Get $75 off $375+ when you pay with PayPal"
Click Save Offer
A popup may appear with details for this offer, click Save Offer on the popup as well
Go to your PayPal Wallet and confirm the "B&H $75.00" offer shows in the Offers section of the sidebar
Go to B&H Photo Video to use this offer.

Offer Details (see full terms when clicking Save Offer from your PayPal account):
Offer available to select accounts only
Discount will be automatically applied by PayPal.
Offer ends 11:59:59 p.m. ET on August 25, 2021.
"Reward": $75 USD voucher that will be viewable in the "Offers" section of the Eligible Participant's Valid Account for personal or premier accounts. For business accounts, the Reward will only be visible during checkout and on the purchase transaction receipt(s).