Good luck getting a Spotted gar unless you catch it. Florida's are what your going to see 99% of the time despite the spotted gar label. As for gators just make sure you have the proper set up for a 5' fish. Try Aquascapeonline for a gator hes had them in the past.
You may want to look into just getting a Florida Gar for now. The Alligator Gars is a little more interesting of course however I've had to update my whole living arrangements because of my boy. He's worth all the time and effort, but go easy with your first Gar.