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Why not do your own, I used a jewelers file and finished up with oil and crocus cloth. Rounding the crown of the firing pin interrupter really got rid of that crunchy trigger take up: http://www.burwellgunsmithing.com/M&Ptriggerjob1.htm the gun is ten times better and it only took about an hour to complete
I have a M&P 45, or order this from Midway if you own a 9MM or .40 (.45 is different and they don't stock it) 48 state sear assembly: http://www.midwayusa.com/viewProduct/?productNumber=883689
You knock out one roll pin drop it in and instant 6 lb trigger for $28.00.
If you change out the Sear block you should also change out the trigger return spring. The spring made alot of difference for me.
Check if your gun has the locking mechanism on the Sear. The one from Midway does. Brownells has both models with and without.
Both spring and blocks were instock at Brownells 2 days ago.