You should try and see if you can't find some supplies locally instead of thru mailing, this can really save you alot of money. And the ease of just being able to pick things up is just great.
I really like the reptile bark made by
Zoomed - I use this in a mix of peat and perlite. Even tho' the bark is small, it lasts a long time.
Repot me has some real nice mixes, but some items are a bit pricey and the shipping can also be costly. The folks there are wonderful to deal with. Good friendly service, they actually care
Any sucessful mix is brought on by trial & error - we learn what works for us.