Any agent can help you with auctions. They may have to register with the auction company and may have to accompany you at the auction. I just completed an online auction for my buyer in Oakland.
Let me know if you need more details.
The foreclosure auction at the county courthouse steps is very different. They require all cash, and you have to figure out what exactly is on title. I know people who will buy at foreclosure auction for you at a serious fee. Let me know if interested.