I would recommend several sources.
Best day, a forum member here that appears to live in your vicinity. Here's the link to his listing:
Banana plants for sale in SoCal
pitangadiego, another forum member here, but a bit further away in San Diego. He's got a lovely assortment of varieties and can probably recommend other varieties for you.
Plants for sale in San Diego
sddarkman619, a forum moderator. He does mail order banana plants, not sure if he's got any in stock right now but it's worth asking.
https://www.bananatreesforsale.com/
As for other edible banana cultivars, Raja Puri is fairly similar to Dwarf Brazilian in most respects. There's another "Manzano"/"Apple" variety floating around, sometimes called "Silk Fig" to not confuse it with Brazilian. Dwarf Orinoco is fairly common, but not exciting to most folks. Namwa is a popular one (that comes in tall and short forms), it sometimes has a bit of acidity/tartness like an apple. I'd suggest buying some at an Asian market (they're often sold as Thai bananas) to taste test.