Have you tried a mates decks or something? If you're wanting to scratch you'll want to get direct-drive decks as they have more torque and are much easier to scratch on as belt-driven decks are just about impossible to scratch on and are hard to mix on.
I did a short DJ course to help myself decide whether DJ'ing was for me. I enjoyed it lots and now I'm saving for some technics 1200's

I was like you at the start thinking about those box deals, but you'll need to upgrade at some time if you stick with it.
My advice with box deals would be to get at least some direct drive turntables. The mixer won't be great, but it'll be enough for basic mixing / scratches.
- J