At this time, SellHound is providing fixed price style "Buy It Now" listings that are Good Till Canceled. This means that the listings renew every 30 days.
If you don’t want your listing to be live for 30 days at a fixed price, you are welcome to end your listing and relist it in any format or duration that you would like to list.
If you want to accept "Best Offers", before you post your item to eBay, you can go to the eBay Preferences section in your Account Screen to add the Best Offer option to your listings.