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I would do a Google search for growers that should be able to ship to you.
You can also check Ebay and Etsy. They are often good sources for unusual plants.

I will pass this information on to our editors! Thanks.

Since begonias prefer moderate temperatures, it would only be a good idea to move them to a cold greenhouse if you live in an area where there is no hard freeze in the winter. They won't withstand a freeze, but they can handle temperatures, generally, down to around fifty degrees.

Here's an article about Angel Wings that may be helpful. Enjoy your beautiful plant.
https://www.gardeningknowhow.com/ornamental/flowers/begonia/angel-wing-begonia-care.htm

I have found that adding more light seems to induce blooms more than anything. Do you have a west or south facing window? Dolphin plants need indirect bright light, so don't place it where it gets direct sun. You also could add a T-5 fluorescent or LED Grow Light if no brighter windows are available.

Also, let the soil dry out between waterings. They only need fertilizer once or twice a year, so you may be overfertilizing.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/dolphin-plant/growing-dolphin-succulent-plants.htm

Yes, this plant has been grouped in with Senecio, now!

I notice a few things here:

The soil appears to be clay. This will be the cause of everything that has happened to the plant.

Clay soil holds too much moisture. It dries, completely, on top and remains completely saturated underneath, while becoming compacted.

The soil should consist of compost and potting soil mixed with sand, or even some cactus mix thrown in. This will allow proper water and air flow. After the soil is amended, carefully, you can treat for black spot fungus.

Here are some articles that will help:

https://www.gardeningknowhow.com/ornamental/cacti-succulents/senecio-chalk-sticks/what-is-senecio.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm

Unfortunately, that one different shoot was a flower stalk. The rest are arms that can be propagated. Even single leaves can be propagated!

That pre-bloom will likely abort in the pot. There is a possibility that it may root at some point, and shoot a vegetative stalk, though.

I would wait until the plant is well established before taking cuttings. It will give you more availability, and harm the plant's stature less to wait.

Taking cuttings from these drought tolerant plants is simple. Laying a leaf, or branch on top of the soil rather than into the soil will result in rooting, as they require the dry air to initiate the process.

In the future, you may find that each leaf that falls off will start to root if not removed from the container.