If you find an item you'd like to buy that is in the store then you can likely find the same item online for much cheaper and another plus with buying online is you can save on sales tax which also adds into the savings.
For example I needed a starter for my car. I looked at Autozone and they wanted $150.00 for the starter.
I looked online and got the same exact starter for my car for $50.00 including shipping and no sales tax.
I saved $100.00 right there.