Where to sell barely used Willow pump?

Hi! I purchased a willow pump and parts for about $500 back in February before the pandemic hit thinking I was going back to work. I only used it maybe 3x and just didn’t need to anymore since I exclusively BF. I’ve had it boxed up and ever since.

Does anyone know of somewhere or recommend someplace I could sell it? I would love another mom who could really benefit from it have it for a much better price than what it costs to buy it at full price!

Thanks!