Magento provides you with a lot of options for the prices of your products. You can configure special prices, timed promotions and much more. To start editing your product prices, first login to your Magento admin page and go to Catalog -> Products.
Now, locate the product whose price you want to modify and click on it to open up the Edit screen. Then next to the Price section you would see Advanced pricing.
Click on the Advanced pricing link to open up a pop up window where you can set the pricing options.
Special Pricing is a discounted price off of the retail price. It is most often used when an item is on sale. Special price can be set up with specific dates ranges so that you don't need to manually update each product when the sale is over. It can be configured via the Special Price From menu.
The Cost section is used to assign a cost price as well so you can manage profitability a lot easier.
To setup tier pricing, you should use the Customer Group Price. If you store has several websites, select the Website the tier pricing should be applied for. Select a Customer Group that the tier pricing should be applied for as well. In the Quantity field, enter the quantity that must be orders to receive the tier price and in the Price field, you should enter the price for specific amount of products.