Update README.md

projects/kake's nfc card/README.md

@@ -11,7 +11,7 @@ tutorial: https://jams.hackclub.com/jam/hacker-card#Turn%20your%20design...%20in
 This PCB, as per the "PCB Hacker Card" tutorial, is like a business card but with one catch: it has NFC! The NFC chip on the card can be programmed to store a variety of things, from my email to a link to a website. This card is definitely not your average business card.
 
 ## Cost
-This design should cost $40.13.
+This design should cost $40.33.
 
 ## Design
 While editing the PCB, I realized that the pads on the front of the board went all the way through to the other side, which didn't look good. So I did a bit of digging around the internet and figured out that I could use blind vias to have a trace on multiple layers without having an ugly hole in my PCB.