Yeah, shipping an offset to CA really kills the overall price of a new one for cheap b@sterds (like me). Plus, many of the good builders have long wait times. If you have to have new, there are CA builders around.
For used: Check the usual: Facebook Marketplace, Craigslist, Offer-up... and you'll eventually find a deal. I was looking for several months before I bought mine and there were several offsets I thought were excellent and priced well during that time. I was picky so didn't jump until I saw "my" Klose show up ~60 miles away. Drove up with a uhaul trailer, brought it home and repainted it and it looks and works great.
Don't be afraid of a little rust if you're even a little handy. The 1/4 or, 3/8" steel on good offsets would take a long time to rust through and generally just need a little work to make them look like new. The rust turns people off so, you can negotiate a good deal.