They have an auction price and they also post an amount available. they also have a buy it now price on some items. You bid on the item you want and the quantity, and when the auction is over they contact you. if you have bid on more than one auction, you can combine shipping to save cost. If anyone has anything else to add to this, please do.
You need to keep an eye on your bid as it gets crazy sometimes and people will bid silly amounts and not make it worth it. Also you may loose a bid by a few cents if you don't keep an eye on it.
