Welp I may be fucked

Welp, I may be officially fucked......I lost heat in my car as I idle and when I took it in they told me the car is shot.....Trying to find a replacement but as all I have is about $600 all I'm finding is "Parts" cars for sale....or they'll have the "Price" set to $1 but then in the Description they say they want $3900 or some shit like that.