I've never been on a Maine Bear Hunt but If it was something I were interested in and Maine was my preferred location choice,
I'd probably look into
Cedar Ridge Outfitters first,,, owned and operated by
Hal Blood so you can expect the prices are going to be a little higher
but may be well worth the difference you'll pay.
I've heard nothing but good about them, be sure to check out the video on the link. Good Luck