In Oblivion Remastered, you can buy lockpicks primarily from the following sources:

• Shady Sam : The easiest and most accessible vendor for lockpicks. He is located outside the Imperial City walls, northwest side near the Elven Gardens district. Shady Sam sells lockpicks for 6 gold each and has a daily stock of up to 30 lockpicks, which replenishes every day

• Thieves Guild Fences : If you join the Thieves Guild, you gain access to fences who sell lockpicks. The first fence is Ongar the World-Weary in Bruma. Fences have a larger stock (up to 100 lockpicks) available for purchase at 6 gold each. This option requires you to join the Thieves Guild and complete some quests

• Other Merchants : Some other merchants sell lockpicks, but Shady Sam and the Thieves Guild fences are the most reliable sources

Additionally, you can find lockpicks by looting chests, containers, and defeated enemies such as bandits and goblins throughout the game world

. A useful tip is to complete the Nocturnal Daedric Shrine quest to obtain the Skeleton Key, an unbreakable lockpick that greatly eases lockpicking

. In summary, to buy lockpicks in Oblivion Remastered, your best options are Shady Sam outside the Imperial City or fences after joining the Thieves Guild. Looting also supplements your supply during exploration.