As stated above, if you have been selected to attend a reserve academy, you can use your commission card with GT distributors and buy a blue label Glock for under 400 new; shipping was $20 the last time I purchased from them. I'm surprised they want you to provide a shotgun. CLEET has stopped training new cadets the art of the shotgun.
That's pretty standard across the country, sadly. Our recruits used to get a week of shotgun. Now, it's a follow-on school, if you want it. ILEA (our version of CLEET) dropped shotguns out of their Basic Class a long time ago, other than a familiarization course. The big push is shotguns as a less-lethal launcher, rifles as the lethal long gun. We were highly encouraged to turn in our lethal shotguns to have them converted. A handful of us refused - I carry both a shotgun and rifle, but the shotgun is just there for breeching and putting down wildlife.