Alright so if you dont mind using exploits...
There is this dungeon in the mountain range directly south and a little to the left of winterhold. Its called the "SIghtless Pit" I believe...Basically, if you DONT go inside, but you walk around and to the top of the hill...there will be a skeleton there. Kill the skele, and search him. He will have a "Book of Oblivion". But dont pick it up....exit the search menu...now hit it again..he will have 2 of them..keep repeating and pick up like 100, go back to town, sell, and re-do. If your speech is high enough it will be about 50 gold per book.
GG
Now, if u have PC just console command gold in...if you have morals, then dont.
If you didnt quite understand the Book of Oblivion thing, then search it on youtube, many great videos.