ive looked around at my local junk yards AND NO ONE HAS A 4.10 OR 3.73

LOOKS LIKE I CANNT SWAP EM OUT
how much a new rear end cost from the dealership at cost? im setup thru my dads company to buy direct preaty cheap but ive never asked the cost for a rear end.
sold old 95
now i have a 93 regcab long bed for my work truck.
and heres my 2 toys, my nice auto 99black civic, and my project 96dx 5speed toy, ya im a GM sinner BUT im geting twice the MPG.