Hi Daniel,
Kind of quick answer to this is yes there is. I’ve just been doing this myself over the past few weeks so can answer from my own (limited) experience. However, the first thing about this is that you are immediately confronted by the need to address copyright laws on the original tracks you either edit or mash-up. There are many on sites like Juno & Bandcamp however who may or may not have had clearance to use tracks, I find it hard to believe that every single edit has had clearance on there!
I personally use Legitmix for my edits/re-rubs/reworks/whatever. I have a lot of time for this way of doing it. It is (IMO) the only platform I’m aware of that attempts to pragmatically address the utter minefield that is copyright laws and DJ’ing/edits. However others on here may be able to signpost to others. Check it out at https://legitmix.com/. I’m still not 100% sure of how watertight this is, but it positions itself as a clean way of addressing copyright. The jist is that you submit an edit or mash up for others to buy, identifying the tracks you use in the mix. When someone wants to buy it, the Legitmix app (they have to download it) searches the buyers’ hard drive for the version of the track(s) used to create the mash-up or edit. If the buyer does not have it, they are directed to the US itunes store to buy it. Then Legitmix recreates the mash-up for the buyer. Bingo. You can choose how much to sell the tracks for (I personally have mine as free on there) so the buyer pays your ‘fee’ as well as the $0.99 or so the itunes track costs. I really like it personally, but I’ve hit snags on several occasions not being able to put tracks on there if the original is unavailable in the US itunes store, which is not infrequently. also, it is a faff having to download and use the app: I think there’s an argument that it’s a bit too tricky for buyers, might put them off. But again this is just my opinion looking at my stats on there. It takes about 5 minutes to complete purchase of a track from beginning to end once the app is on your PC or Mac.
So, Legitmix aside there are other places (as mentioned above) but you will be asked to confirm you hold copyright to the material you use before you can put them up for sale. You may be lucky and have agreements to use your tracks, I certainly don’t.
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