If you are an avid Craigslister, as I am, you can find them there if you are paient. People damage them - sometimes very minor - then give them away instead of repairing. I am talking Thule and Yakima, which cost big bucks.
Don’t know where in California you are, but here is a cheap Thule for sale:
i agree with @Faceplant, as someone that has looked into these storage boxes, they are exorbitantly expensive a lot of the time ($500+). you're best off looking at craigslist or (shudder) FB marketplace for used versions.
some alternatives you might consider would be this one from amazon, which is huge for the price ($220), I can fit my entire body in it:
I used this one from Omaha through South Dakota to butte Montana down through yellowstone and denver/Colorado springs back to Omaha with my tool boxes on it an ax and a shovel , it was super cheap ill ask my girl where she ordered it it was like $60 or something and did EXACTLY what your wanting cleared space in our truck to move around .
.....im actually wanting to but a second one to clear up even more space and probably another husky tool box ($50 and water proof) .
Works great I just organized everything in dry bags so I new what was what by the color of the bottom of the bag so i didnt have to sort through a mountain of stuff and have a bum explosion looking for socks lol
The first $50 in donations go towards paying our monthly server fees and adding new features to the website. Once this goal is reached, we'll see about feeding Matt that burrito.
Buy Matt a Beer
$35.00 of $75.00
Now that we have the bills paid for this month, let's give Matt a hearty thank you by buying him a drink for all the hard work he's done for StP. Hopefully this will help keep him from going insane after a long day of squishing website bugs.
Feed Matt a Burrito
$35.00 of $100.00
Now that the bills are paid and Matt has a beer in his hand, how about showing him your love by rewarding all his hard work with a big fat burrito to put in his mouth. This will keep him alive while programming new features for the website.
Finance the Shopping Cart
$35.00 of $200.00
Now that the bills are paid and Matt is fed, perhaps it's time to start planning for those twilight years under the bridge... if only he had that golden shopping cart all the oogles are bragging about these days.