I was mowing my lawn and mower was running fine. I shut it off for a moment and when I tried to start it again, I got nothing but a click at the solenoid. It has a brand new battery that has a good charge. Any suggestions? Also, if it is the solenoid, any good sites to find one?

You can purchase a solenoid at most auto parts houses if nothing else. Expect to pay $8.00 to $14.00 if you do not purchase oem equipment. You could also have a bad ground where the solenoid mounts to the frame. Remove solenoid, clean mounting area, and remount.