Negotiating on Price / Loan terms

[Daniel Fenn]

I've heard that banks have a set discount rate from the BPO (Broker Price Opinion) that they will not go below.  Does anyone know which banks/lenders have the best discount rates?

In case they don't budge on price, will they negotiate on the loan terms if I bring business to their bank by taking a loan with them. For example to get better terms, instead of an amortized loan, would they give a simple interest loan, where the principal and interest are fixed and do not change until the loan is fully paid?

What banks/lenders would typically be willing to negotiate on price and/or loan terms or downpayment?  In this deal I am looking at, the lender is Freddie Mac.