http://frc-events.usfirst.org/ has data for qualification matches, elimination matches, and rankings for some regionals and district events that TBA doesn't. From what I can tell the three come together (if an event has one, it has all three) but I didn't test every single one. Elims have results but the teams in alliances past QFs aren't included.
Those that have data:
Those I can't find data for:
- Inland Empire
- Georgia Southern
- NE Granite State (schedule but no data)
- NE Waterbury (schedule but no data)
- PNW Oregon City
This has been the best source for match data (and the only one that comes directly from FIRST) that I've found so far.