You can also buy ochrilium, make it into a plate, then upgrade it to legendary and sell it back for a huge profit.
If you're looking for Hearts head up to the magic college in winterhold, in the student's quarters there's an elf that will sell you two every 48 hours. Just ask him about "things that can't be sold in the college" or something similar.
"He who koops and runs away lives to koop another day!" - King Koopa