I sold my serger on ebay...got what I thought was a fair price, and it arrived at the buyer's place just fine.
I also collect child's sewing machines...have purchased many from ebay...never, ever had a problem...
the only thing that i would caution is to look at the seller's rating...if they hqve sold 300 items and have 100% positive feedback...then I would buy from them...if this is their first sale...I would be cautious...
Just know that you can always go through an escrow service...they will hold your payment until you receive the item and are satisfied...there is a small percentage fee, but very well worth it if you are nervous about the sale! Much better than losing the entire amount,ot having to fight for it...