Get National Stock numbers for the items you are looking for, and search by those. Learn the "military" way of naming things and search by name on the website. Check the site daily, because the really good stuff goes very fast. What specific items do you need? Give me some ideas, and I might be able to get you pointed in the right direction.
Weapons are completely separate from the other processes. For normal gear you requisition, it may take a few weeks to show up. Weapons have to go on completely separate paperwork, and you have to pay for the weapons. Those take 2-4 months to arrive.
Think outside of the box. The military has a little bit of everything. Don't just focus on the high-speed stuff; you can get items like office furniture, vehicles, computers and less "sexy" things that can save your agency thousands of dollars that you can use to buy something else.