Listing is for 1 unit (9 units in photos).

I have other self-watering planters in various sizes (5", 4", 10") listed and all my listings CAN be combined.  

these are used but work perfectly (I even glued the styrofoam ball to bottom of level indicator to prevent it from getting stuck or falling to the side which can result in false readings). 

• No overwatering or root rot! nested pot sub-irrigation set features inner basket for your plant and medium, and an outer basket that functions as the reservoir, providing just the right amount of moisture, drainage, and aeration.  
• Durable, high-quality, frost and UV resistant polypropylene (practically unbreakable) that holds up to life, providing easy maintenance, minimal mess, no rusting peeling, denting, or fading (in direct sunlight).

• convenient water level indicator that lets you know when it’s time to refill- depending on the drinking habits of your plants, this could be a couple weeks!
• 7"D x 7"W x 6.8"H
• Capacity: 2 quarts