Sorry for all the posts lol...I've just been browsing and noticed that you can still pick up the Duncan Pro Z on Amazon as well! They use to sell them at Walmart and Target.
And I LOVE this yoyo so much for the price! It is such an incredible value for what you get and for everything it does! They're less than $11!
https://www.amazon.com/Duncan-Shape-Changing-Yo-Yo-Green/dp/B083H9CBFG?ref_=ast_sto_dp&th=1
It's a really cool yoyo...you said you liked your nephew's Duncan Pulse...the shape and feel of it...well the really neat thing about the Duncan Pro Z is it transform into 2 shapes. The first shape is the same shape as the Pulse...but then if you ever do get an itch to try more tricks out, it also comes with little plastic spacers that can convert it into a wider shape that makes it easier to land on strings.
It is a super fun yoyo and would be great for just being a basic yoyo for you...but then if you ever decide to try some tricks out, it gives you everything you need without further purchases!
But if it looks like it's a little more than you're looking for right now...with the spacers and extra bearing and everything...that's totally okay too and I still highly recommend the Butterfly XT!