You're welcome Moosiey!
I was waiting in line at the pharmacist's last week, and standing next to a supplement display. It was taking forever and I thought I'd take a look at the magnesium supplements, and they were all oxide and glutamate. I couldn't believe it. And they were so expensive on top of that!
You could have a look at some of the good online shops, and choose a good brand, that's where I get mine.