Due to the fact that it is much easier to get gold via quests in SoD, the prices for riding and mounts have been doubled with the latest maintenance work.
You now have to pay 20 gold for riding without bonuses and 80 or 1000 gold for the corresponding mounts.
I don’t think this should be a big problem, as you should be able to get quite a bit of gold in the 25 to 40 level phase.