Im looking for 40 pairs of tall black tactical boots but I'm on a budget. Any ideas on places I should look for a cheap,

preferably under $100 or a special deal on large quantity orders.

Try ebay

Army surplus in your area. Or your local flee markets. That's where all the good deals are. I'm not sure where your from, but you can if you don't have already down load the Google maps. It will show you any things useful in your area. It's a free app