http://www.youtube.com/watch?v=UZcQGyZBB0A

1. Find Sightless Pit South of Winterhold
2. Go sligthly west turn, go up in the mountain and turn east.
3. Disturb the skeleton and kill it "Make sure to see where the corpse go"
4. Kill the other 2 skeletons that spawns.
5. The first skeletons corpse with spawn a book called "doors of oblivion" each time you enter and exit the skeleton corpse.

Tips: Put as many books as you can in your Inventory and Mount a horse this will still allow you to quick travel.

Quick and easy guide on how to make a ton of gold. Works on xbox 360 and ps3 as well.

Feel like it would take longer than what I've been doing

Which is?

most likely crafting

or using a console command...

Or just playing the game....Unless you load up on speech perks that book doesn't sell for that much.