Great find for the price indeed! You plant looks like S. 'Nicolai' the white flowering Bird of Paradise. I've had mine for almost ten years or so, and it's never flowered. Even without flowers, the leaves alone are beautiful enough (can be hard if not impossible getting them to flower indoors) As it grows, the leaves tend to tear a little bit on the ends of the leaves, something they do naturally in nature to help protect the leaves from wind damage, so don't panic!
Well and truly looks like a strelitzia to me. I have one. Took about 10 years after purchasing before it bloomed (inside) and now it blooms a couple of times a year. Never more than 4 blooms mind you, but you can bring them to bloom indoors. With mine, it got quite mature (several offsets from that first growth like you see in your picture) at which point I put it in a very large pot (size appropriate though). After several years in that pot, when it started to push up slightly from the pot as though it was beginning to get rootbound, it started to bloom. Goes with what I've read too. Mine is S. reginae. Used to have Mandela's Gold (very pretty in pictures), but it didn't bloom. Didn't have it long enough I expect. Should have kept it. Anyway, nice little plant you've got there. They are very architectural plants.
