I use Black Diamond 20/40, blasting media. 7-8$ for a 50lb bag. I just picked up 4 backs of it yesterday actually from Tractor supply. 4-5 years ago when I had my first 75g It's what i used (3m color quartz back then actually), and it's currently in my both of my daughters 20 gal tanks where they have plants that are thriving (had to remove them from my 125g due to being too hat)
I'd look in to that if you don't feel like paying pet shop premiums.
That is what I use.. I have it in 6 tanks and love it!!! Never had any problems with it getting in filters or messing with the fish!!
However I can not stress enough to you how important it is to clean it very, very, very, very good!!! And after you think it is clean clean it 2 more times!!! Then after you get it all clean find the biggest strongest magnet you can find and run it through it real good for a long time over and over again because it does have little tiny pieces of metal in it that will poke the fish if you don't get it all out!!!