Hi Paul,
You will find a number of suppliers in your niche on Syncee, like BigBuy or Elite Tactical Force Ltd. All of them offer dropshipping service and fast shipping products. Once you find products you like you can easily add them to your Shopify store, and Syncee will update the product data automatically every day, moreover, your orders will be automatically synchronized as well right to your supplier. https://apps.shopify.com/syncee-1