The chip retails for $60 but since you're verified, go do some looking in the buying/selling area
The c&k switches are about $1.30 each. I got antivandal switches for the fire buttons for $6 each because I hate those little pointy buttons. But got the little ones for the up and down buttons. FDV510 $4-6.
I have wire, flux and solder.
So you could have a DNA40 with a nicer fire button and best 510 for $80 using the body and battery sled from yours. And that's if you pay retail for the chip.