Why so many? Are you planning on selling?
Do you already have a connect or are you still looking for a dealer? If you don't have a dealer it can be kind of sketch sometimes, so I'd recommend trying to find it through someone you trust.
If that's not an option you can buy kits to test the drugs to make sure that you're buying what you think you're buying. I don't have any personal experience with them, but apparently the
Bunk Police make very effective tests kits.
Edit: Also, I dunno about prices in your area, but around here acid usually costs 10 bucks a tab. Anything drastically more than that should raise an eyebrow. If it's much less you might be wary as well, although a lot of the time people knock prices for buying in bulk.