Online shopping is the 'thing' these days and there are a plenty of websites that trick you to buy Laptop DC Power Jack for Asus Q550J Q550JA Q550JK Q550JV Q550JX Q551LN R750 R750J R750JK R750JV online, but there's zero that would guide you - giving out the fundamentals of buying stuff online. So , assuming that you've got all facts packed about the need to is sold with goods online. Mathematics has never been cool, especially for me - so for those like me or otherwise I suggest you to understand the math behind the discounts while offering. Take your time - understand the expense, the discount and do a lot of calculations; trust me you'll never get it wrong. Stop Buying Things You Actually have - The problem with most of the people is that they tend to buy exactly what they like - even if they already have it in abundance, which is never a smart buyer's characteristic. So what you need to stop performing immediately is stop buying the things you already have - remember there will be another day so you can get something new the next day.