Yahoo Sports reports: Oklahoma City further reduced its potential luxury tax bill for next season by agreeing to trade elite 3-point shooter Isaiah Joe to the Detroit Pistons for two second-round draft picks, a person with knowledge of the deal told The Associated Press on Friday. Joe made 681 3-pointers over the last four regular seasons with the Thunder. Oklahoma City has shed well over $100 million from its potential luxury tax bill for next season in recent days, first by agreeing to trade Aaron Wiggins to Atlanta and now with this move.