Want to sell Boyes Needlemaster Interchangeable Set

I want to sell this set and get the Knitpicks Options. What do you think is a fair price for it? I’ve only used it about 3 times total since I bought it. Thanks for your advice.

Check eBay for a good idea of what the going rate is. When I got mine, the brand new unopened ones were going for about $25 each and that was last fall, so I imagine that it’s about the same now. I don’t know what the out-of-the-package price would be.