It's brand new and some parts are still in boxes. I bought last December.I love it, but we need the money more.

Craigslist, Next Door and similar.

Agreed, but don't expect to get anywhere near "new" value. About 1/2 value at best once it is owned and used, even if "like new"

Take good photos when listing. Show actual sales receipt if possible, to show value.

The issue with selling items like this, you will have a lot of people set an appointment and never show up. Last time I sold something on Craigslist, I got 12 no shows in 5 days.