How do I get out of a dual representation situation?

[Robert Fisher]

I saw a property, was interested, so I emailed for more information, and ended up being in contact with the listing agent who represents the seller.  Now after several rounds of questions and obtaining documents, I want to proceed with making an offer; but I don't feel comfortable talking money strategy with this broker representing the seller.  Typically I would huddle with my broker to work out an offer amount in hopes of saving some money; but I don't know if I can do that in this situation.  What should I do?  Can I bring in another broker to represent me at this stage?