Planning to upgrade my PC

Hi all, I'm thinking to upgrade my PC. Currently, I've i5-12400f and RTX 2070.

So, if I want upgrade the RTX 2070 to RTX 3070. So, what price my 2070 go for? And what's the current price of RTX 3070.

And for CPU, I wanna upgrade it to i5-14400f. So, what price will it go for?

Please share your suggestions?