So I'm in the middle of nightly scratch practice and realize that after less than a couple months the xfader on my new mixer is starting to bleed.
No biggy, we all know these WILL wear (unless you never use them) and we will need to replace it, not once, not twice but like oil changes in our cars we will need to replace them when we wear them out.

So then this got me thinking what else?

Needles for sure

Stay at home dj's, pro gig and mobile dj's
What are your consumables?