Actually lockpicks can be pretty hard to purchase. With the exception of Tingalf in Ars Magicana, they are a random item for merchants, and it can turn out that no one sells them if your luck gets bad.
One can also, I understand, do Finnegans quest in the Verdistis Thieves Guild, and keep the lockpicks rather than giving them back to complete the quest. If the latest patch is installed, they are supposed to be unbreakable (install patch before getting lockpicks).
However, the bulk of the supply of lockpicks will normally be random drops. Go fight some stuff for a while if you are getting short.
Last edited by Tiffin; 19/03/03 09:41 PM.