In early 2019 they pulled Clarity back to mainly just CA, OR and east coast ZEV states. Then shortly afterwards they pulled back to California for the remainder of the year. So most cars on the east coast have been sitting on the lot since early 2019, with no dealer incentives from Honda to help move them. You can tell by the VIN numbers, which range from under 001000 for cars produced at the beginning of the year to 007000 for cars produced in November/December.
In the past few weeks a few brand new 2019 Base models were sprinkled into several states, including Maryland, Ohio, Washington and Oregon. My theory is that being the end of the year some California dealers were holding off ordering any more 2019's and so a few Base models were made available in some other states. Someone says there was even a new Touring recently available in Washington but it sold pretty quickly (probably at MSRP).
We're waiting to see what happens with the 2020 model but no reason to believe things will change, but you never know. The best bet is probably to get one from California and have it shipped. Won't get as good of a deal as a California resident, but I have heard of as much as $2,500 discount from MSRP for non-residents. That will of course be offset by shipping cost, which should be under $1,000, and the cost of airfare, Uber etc. if you want to see the car in person and test drive before purchasing. But still in the end I think a net savings of $1,000 under MSRP should be doable, maybe even better when the 2020's arrive and dealers want to clear out the 2019's. And you will likely have a better chance of getting the color you want and also not have a bunch of dealer add ons. And once you find a car you want and a dealer willing to make a deal you can have the car in your driveway in about two weeks, instead of waiting months possibly for something to show up locally, if ever. You can also try finding a local dealer willing to order a car, but most people seem to hit a brick wall when they try that.
Not all California dealers are open to selling out of state, probably because they wind up spending more time on it especially if the buyer wants the dealer to figure everything out.
I recommend do a little research, go online to the California sales tax website to view the form that dealers submit for out of state car sales, then when the dealer finds out you are familiar with the process they will likely be less wary of working with you which could also lead to a lower price. Even better is to tell the dealer you will handle shipping, it's not as intimidating as it sounds you can arrange that online and get quotes. And tell the dealer that you will arrange for a notary to be present at delivery, easiest way to do that is to have delivery take place at the notary's office.