We've updated the Steam Community Market with some more changes:
All Steam Trading Cards, Emoticons, Booster Packs, and Profile Backgrounds now appear as commodities, with its easier method of purchasing and improved data display.
There is now a 'recent activity' display for these items, which shows buy & sell activity that has occurred in the last few seconds. Only a sample of the activity it shown, and only users who have their community profile set to public are shown.
There is a Buy & Sell Order graph (added yesterday) at the bottom of the page for commodity items, that expands on the data shown under the 'buy' and 'sell' buttons higher on the page.
We've updated the Steam Community Market with a new method of purchasing - Buy Orders. A buy order is an order to purchase a commodity item at or below the specified price. This order stays in place until it is fulfilled or cancelled.
Buy orders can only be used on commodity items, which are items that are all identical to each other (no variations in description or function). To start with, we only have marked Half-Life 2 Trading Cards as commodities (links below). We'll expand that as we work through any issues with the system.
You can have multiple buy orders outstanding - up to 10 times your current wallet balance. If an item gets listed for a lower price than what you have on your buy order, you will receive the lower price. The buy order with the highest price gets priority for purchasing newly listed items. If there are multiple orders with the same high price, the oldest buy order gets fulfilled first. Buy orders can be cancelled at any time, by you or the system - if the item changes, if you no longer have enough funds in your wallet, or if there are any issues during an attempted purchase.