Try rutracker.org or rutracker.ru. It may take a few days, up to a week sometimes, but they mostly have the latest releases from dance music. The most active though on rutracker.org is the Psytrance community, so the genres you mentioned might not get the latest stuff posted frequently.
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I'm into the real dubstep scene and without looking into private trackers your best bets are soulseek or ripping the tracks yourself from Spotify if they get a release on there.
Beyond that I haven't found any other, better resources other than just going ahead and buying stuff. Also you didn't mention bandcamp so you should probably check that out if you haven't already. Not a fan of beatport or Juno personally.
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