http://www.nutraplanet.com/product/nutraplanet/bcaa-s-500-grams.html
Try some of those out. Glutamine isn't worth it IMO.
BCAAs are worth it PRE workout or DURING your workout IMO. I don't know if it was placebo effect but I got less sore and had more endurance when using BCAAs. They are cheap. You can get a kilo for $50 and you need maybe 5-10g a day.
Give it a try and see if you like it.
OH, and sorry they aren't necessarily going to give you "gains" in themselves. But for me they helped recovery and endurance to allow me a few more reps and work out a little more often.
The only supplements I'd really recommend (and I've gone through a ton) are
level 1
multivitamin
protein
creatine
fish oil
level 2
BCAA
pre workout drink (if you like stimulants / pump enchancers)
I really can't think of anything else that is that importantant unless you just like to play around in the supplement market and have some money to spend. It can be fun to try different stuff.