You should run away. Bonanza has no support for their sellers nor their purchasing clients. They will not give you notice if the seller or buyer is removed from their site for taking your money and running away. They will take your money to register and give no support other than referring you to the funding group such as paypal or netcash. This is not a good group to do business with.
For your own sake, run away as fast as you can!

I would evaluate what they offer from the so called "free tier". See if what they say is true. Seems like they are an RSS feed only advertiser so your item, when searched on the web is competing with powerhouses like eBay and Amazon. Search one of your items now via Google. You'll be lucky to find your bonanza listing with the first 10 or so pages of results. Regardless of their level. Bonanza simply does not have the alliances nor funds to place its sellers in a competing position via user search results.