So far, it seems like the following have decent stats in terms of magnesium RDA:
- 
bagels 
- 
hemp seeds 
- 
psyllium bud cereal 
- 
Evian/San Pellegrino water/spring water 
- 
? 
So far, it seems like the following have decent stats in terms of magnesium RDA:
bagels
hemp seeds
psyllium bud cereal
Evian/San Pellegrino water/spring water
?
Magnesium supplement pills, I imagine.