I am lucky enough to have a real piano but for vocal exercises and learning songs I feel like an electronic keyboard on my desk would be perhaps more convenient. It doesn't need to feel like a real piano, I'd be using it to pick out a melody line or the odd chord (I think).
I'm not sure what I should be looking for - can I literally get the cheapest MIDI keyboard on Amazon or will that be too limited for my simple needs? The only thing I can see I need is a range wide enough I don't have to be switching octaves mid-phrase, but equally something small would be convenient.
Specifically for these purposes, not for playing piano or use as a MIDI controller, what should I look for that I might regret later?
Is everything I'm going to find at the budget end of the keyboard range going to be a MIDI controller that would also be suitable for my needs, or is there a difference between that and a basic keyboard?