Easy ass way to make 10g on a trial account:
1) RaF yourself and set up a new trial account.
2) Level your new twink to level 5 and pick up fishing.
3) Use your main account to summon your twink to Serpent Lake (all trial accounts now have access to TBC content).
4) Find pools of, "Steam Pump Floatsam" and clear the mobs around them so your twink is safe.
5) Profit.
Literally ten minutes of "farming" netted me
x1 Broken Engine Part (10g each)
x1 Goldenscale Vendorfish (6g each)
x2 Steam Pump Debris (50s each)
x1 Weather-Beaten Journal
and various other things that I sold.