Yeah, depending on how crazy you want to get, even the little Numark DJ2GO2 Touch, which I have for some reason, will work just fine. Behold, here is a poorly shot (Edit: YouTube) video of me using it to scratch a sound I made on the Digitone.
There are all kinds of higher end options and even controllers that work with mobile apps instead of Serato like the little Numark there.
And yeah any of the Pioneer CDJs after like the 800s I want to say will work pretty well I think. And you can get those for like 100 dollars.
If you want to mimick really basic stuff, parameter locking the lfos on the Digitakt or even better the 3 on the Octatrack can take you a long way. You just need to be deliberate about what’s actually happening in the scratch you’re thinking of. Here, I just used it to imitate stabs and simple scratches and things, especially if you skip to the end.
Part of it is actually scratched and part of it is the Digitakt. As long as it’s really simple, I think it’s hard to tell what’s what.