Hello: I have a 4 acer U-Pik apple orchard 40 miles S.W. of Chicago. I have been using hornfaced solitary bees for pollination for 10 to 12 years. I'm looking forward to getting helpful info from the members here who use these bees.
Here's an interseting website listing product information and suppliers for alternative pollinators.
http://www.pollinatorparadise.com/solitary_bees/Supply.htm