Don't know how frequently there are gun shows in your area but that is probably where you could find your best deals. You have several dealers in one place so you can go back and forth making a deal.
As far the caliber goes, if you have a gun range in the area that rents guns maybe you can "test" the 9mm vs. .40 cal. to see which you can handle best.
Good luck on the "hunt".
"I ask, Sir, what is the militia? It is the whole people. To disarm the people is the best and most effectual way to enslave them."George Mason - Co-author of the Second Amendment during Virginia's Convention to Ratify the Constitution, 1788