We sell our pumps individually to allow mothers to choose their own style of pumping. Some mothers prefer to pump 1 side at a time and some stay-at-home mothers who latch would only need 1 pump. Or simply just buy 1 to try out first and if it works great for you, you can always get another!
If you intend to exclusively pump, we would recommend that you get a pair as it helps to save time. Also, a pair would come in handy when you are pumping very frequently.
For over-supply mothers, we recommend that you pump 1 side each time, an alternative would be pairing the breast pump with our silicone milk collector or simply using a breast shield.