I love love love this place for my utility pouches, patches and pins. They're mostly known for their Police supplies, and you're not going to find your new favorite stethoscope here, but you will find a belt pouch that fits that stethoscope perfectly!!! Prices are way lower than online retailers, and you can make sure it actually fits your gear before you buy. Maybe a little hard to reach by public transit depending on where you live, but definitely worth the trip. I always visit when I'm posted nearby.
Cons: What cons? Maybe public transit...