Just a quick Wyoming craigslist look shows a diesel truck for $5,500
https://wyoming.craigslist.org/cto/d/sheridan-2000-ford-f250-superduty-73/7305333755.html
or this F550 in Nevada for $7,900.
https://reno.craigslist.org/cto/d/fernley-2005-f550/7305047804.html
Then when you're finished you can sell to recoup most or all of your costs. Drive them through CA in-transit or register in Wyoming first.
https://wyoming.craigslist.org/cto/d/sheridan-2000-ford-f250-superduty-73/7305333755.html
or this F550 in Nevada for $7,900.
https://reno.craigslist.org/cto/d/fernley-2005-f550/7305047804.html
Then when you're finished you can sell to recoup most or all of your costs. Drive them through CA in-transit or register in Wyoming first.