Selling excess breastmilk

Does anyone have any experience selling excess breastmilk? I am due in a month and this will be my 3rd child. For my two other children I was a massive overproducer. My best friend had babies around the same time as my last two and so I donated all my extra milk to her (more than 6000oz. for each child). However she is not pregnant for this one and I am hoping to offset some of my financial loss for maternity leave with selling my extra breastmilk. Wondering where and how I would go about selling it?

Update- I understand donating is another option and I did really enjoy being able to donate to babies with my two previous pregnancies but I feel after donating more than 12,000 ounces that I would like to try and make a little extra money if possible this time around.