If you have more than one Magento store and want to set one price for store A and a different price for store B. Here is how:
Step 1. In the Admin panel, goto System, Configuration, Catalog, then Price.
Step 2. Change Price from Global to Website.
Step 3. You should see “Website” on the price page for the product now, instead of “Global”.
Step 4. For each product you want to set different prices on – select the product, then in the upper left corner you will see the option to chose your store view. Select the first store
Step 5. Set the price for the first store and click “Save and Continue Editing”
Step 6. Select the store view for your second store and set the price for that store
Step 7. Repeat step 6 until all of your store have the prices you want.