I bought it 2 years ago. It had a tag on it for a website. You can find them at the big box stores, nurseries, etc. Usually have them with apple, cherry, orange, etc.
I bring it inside in the fall and put it outside in the spring. Normally I get a few white flowers that I'll help pollinate, but this summer, I've got a massive amount of purple flowers that turned into lemons. It seems to be doing fine in our winters, doesn't drop below 60 in the room it's in. The 2 big lemons are normally firm but they've started to soften. That's why I was thinking they're getting ripe.
I read that the eureka don't have thorns? I'd say this one is somewhat thorny.
I also want to prune this one so it's not so tall but i thought I should wait till it's done growing fruit. However, it seems to be getting fruit year round. Although I've been using a fertilizer that says it's for citrus trees to stimulate fruit growth, so who knows. Ha.