How do you try to buy or bid on totaled vehicles by car insurance companies?

I’m interested in trying to find a vehicle like mine, but wrecked with a good engine and transmission and any other parts I can salvage to keep mine alive for a few more years . I would like to know in general how to search and bid on wrecked vehicles that have been totaled by insurance companies and are now up for bid. This would be kind of like what a wrecking yard must do to purchase vehicles for parts resale, or a used car dealer that would in turn repair the vehicle and resell with salvage title. Any leads on where to start would be appreciated