Heading to one of the big junkyards this Saturday with a friend & my sons. $75 for a wheelbarrow! Any suggestions for the high-value things to pull and have on hand?

My truck: 2003 X5 3.0i w/132k (clean, runs great)
Son: 1994 740il (rough, but running)
Son: 1993 Miata (not running, but pretty good handle on parts needed)

Appreciate any suggestions