Hi Evan,
For SSB, the price is fixed at $1.00. The system does not allow user to set price other than $1.00. If user redeemed the SSB much early before the maturity or before the interest payment. The redeemed price shown in the CDP is listed as $1.xxx depending principal and any accrued interest. Thus, it maybe useful for user to list the price based on what is show on the CDP account. Currently, user need to sell at 1 dollars and add an override dividend for the accrued interest in StocksCafe