I 2nd the mustache comb and Madan pin brush! I actually have one for myself to use.
Some other stuff I found to be very helpful were:
Espress Plum Perfect Facial Cleanser (love the scent!)
Isle of dog's waterless shampoo (for those inbetween baths)
There are few other items I'd like to recommend but only if you're planning on grooming at home like many of us do.