Tranquilizer, p70 - Urban Arcana, under special Ammunition. Used by Air Rifles and Pistols further up in the equipment section.

Other stuff that might be useful:

Net Launcher - Urban Arcana
Sticky Foam Sprayer - Urban Arcana
Blowgun - Urban Arcana, with poisons from d20 Modern

Specialized Equipment - Dark Matter
some drugs, grenades, and other stuff that can be used.

Pepper Spray, Taser, Stungun - d20 Modern

Different types of grenades: smoke, tear gas, flash-bang, etc.