lower than a statutory minimum. IV. Melendez next argues that the government’s confidential informants offered to sell him cocaine at prices substantially below market price, thereby leading him to purchase a significantly greater quantity of cocaine than he ordinarily would have been able to purchase given his available funds. He maintains further that the $12,500 he had available for the drug deal would have enabled him to purchase, on the open market, only between one-half and three-quarters of a kilogram of cocaine instead of the more than 50 kilograms attributed to him by the district court. These facts, he contends, mandate a downward departure under application note 17 to USSG § 2D1.1. Melendez is not in a position to make these arguments, however. In his plea a h Cir.1992) (<HOLDING>), cert. denied, — U.S. -, 113 S.Ct. 1023, 122
holding that defendants may agree to departure from sentencing guidelines in plea bargain recognizing that postoffense rehabilitative efforts while normally not grounds for departure may support departure in extraordinary circumstances and noting that the totality of the circumstances may justify a departure where a single circumstance is not alone sufficient holding that a motion under  5k11 permitted a downward departure from the guideline range but that the departure could not extend below the statutory minimum sentence absent an additional motion by the government under  3553e holding that notice must state the specific grounds for the departure holding that defendants diminished capacity while grounds for departure from the guidelines sentencing range is not grounds for departure below the minimum sentence set by congress