I like this site because it is free to use and very easy. Here you can sell and buy second hand baby items and not need pay high fees for it. It's just AUD$2.50 for each ad you place and they don't charge any fees for extra photos or features. The people who run the site are a couple who are parents themselves as well so they understand a parent's needs. This is a Hidden Gem because it is very new, not many people know about it, and I have found very good bargains through it. It's really worth a look.
You do not need to do anything to get the best price. You only pay the price of the item, and if the person who is selling it is open to negotiation you can use your bargaining skills to get a better deal! You can save a lot of money buying second hand items.