I am actually on Saurfang as well and now got 2 teams up to 80. I know what you're talking about since this is a fairly new server making money off the AH is really slow but it's a lot better by now since quite a few people are rerolling alts.

I was able to buy all mounts when they became available (apart from the epic flyer) and what I did is bascially what already has been covered here so far.

- Disenchanting (I made the most money by doing that)
- Don't buy anthing from the AH
- Try to level all your professions while leveling (if you got spare mats, sell them)
- If you're low on gold try to skip not needed training costs (no points in paying for feral talent points when you're druid is balance speced e.g.).

As soon as you are able to move to Northrend money is really no longer an issue since you make so much through questing.