Shop Online - Save your money:
Negotiation. Just because you're not dealing directly with a person does not mean you cannot negotiate the price. Contact the merchant and let them know why they should give you a discount, often they will match/beat their competitors or at least give you discount shipping. Get the price you want to pay.

Compare. Make a quick search for competitors who sell the same product. There are plenty of sites offering comparative shopping. Get the best price available online.

Coupons. Search for coupons for the merchant. Often the merchant offers discounts to visitors of other sites. There are also directories that specialize in giving away discount coupons.

Join special offer mailing lists. You will be notified of many merchant discounts. Get the offers directly and save money.

Reward Schemes. Shop within a network of merchants. Most have a rewards scheme earning you points that you can cash in towards other purchases.