Saskatchewan, western or northern Manitoba, and eastern Alberta in Canada aren't bad. The west 2/3 of North and South Dakota, eastern Nebraska, western Iowa, western Missouri, the rice fields of Arkansas, and central Texas angling over to the coast from Houston north to Louisiana, and coastal LA.

Ive been told there are also opportunities on the East coast in Delaware, Maryland, and Virginia but I haven't hunted geese there. Then there is the West Coast from Washington down into California though I haven't partaken in those states either.

I personally can't recommend any offhand, but there are plenty to chose from. I have my own equipment and meet up with others for more equipment and helping hands. I would look for those who have been around at least a decade to help winnow out the poor ones or those just getting started and may be limited in resources.