Now that we are using Economy instead of Iconomy, we need a new way to make shops.
And here we have it ^^
First of all you need ONLY a sign (NO chest!)
Place the sign were you want it and type the following lines on the sign if you want to sell some items:
1. line: here you have to write [trade] to let the sign and the ppl know what you want. ^^
2. line: here you write the $ sign and the amount you want for the item.
3. line: now write the amount you want to give at once and the item name or the ID followed by a ":" and the total amount you want to sell
(you can only write a total number that you can divide by the first number: 3 items at ones:total (3,6,9,12,15,18,...) items).
4. line: here will be the name of the owner from the signshop (it will automatically generated).
If you want to restock the signshop take the item in the hand and right-click on the sign.

Now wenn you want to buy some items with a shop from players you have to change money in line 2 with the amount of items in line 3
