My sister says Costco has some on sale right now, so I should check that out. If they don't have what I want, there's a hardware store that sells a small hand-full. I've looked those over already, so those will be my last resort. Before going to them, though, there's a place near Tracy that's right off the freeway that sell all types of trailers, from little to big, open to closed, etc.
I'll go to Costco first, it's closest.
Then to that other place by the freeway near Tracy.
If I haven't gotten anything by then, I'll check out that hardware store one more time.
Somewhere between Costco and the hardware store, I might check out Home Depot, because they've got a few as well, although those are generally over-priced.