How far into MD are you looking?
I took classes with Tecla Walton at Tecla's K9 Academy for various sports. She has private instruction for IPO and has a decoy that comes in every two weeks.
I have also heard Karen Decker with P.U.P.S. offers private instruction for IPO. She also is in the Howard County Working Dog Club and have had a Nationals competitor recommend her to me a while back. I haven't personally trained with her so I can't speak of her training methods.
If you're looking for something closer to the DE line, hopefully someone can point out a place to go.
+ Kalbi CGC 6/21/2015
+ Blackthorn's Out of the Frying Pan NW1 ORT SEN SCN BCAT SIN RATN TKN (Katsu) 9/12/2017
+ Blackthorn's Skofnung CGC TKN RATI RATO (Steel) 07/23/2018