I've found tons.
There's no point to them, the dungeons and whatnot aren't dark at all.
Mods'll fix it.
I've found a lot of torches as well, namely:
1. On the walls of caves and dungeons. If you can "activate" the wall torch, you can take it.
2. I've seen the occasional one for sale from a merchant.
3. Nearly every town guard has one in their inventory. Just pickpocket them if you like.
But yeah, there is really no need for torches in the game. Every once and a while they are useful to illuminate a dark corner or to see the face of an NPC you are talking to when they are facing away from a light source, but the light design and placement in dungeons and caves is so good in Skyrim that there is no need for torches while exploring.