Online shopping is the 'thing' these days and there are a plenty of websites that allure you to buy 100pcs MMBT4401 SOT-23 2X over the internet, but there's non-e that will guide you - giving out the basics of buying stuff online. So , assuming that you've got all particulars packed about the need to purchase your 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 and offers. Take your time - understand the price, the discount and do several calculations; trust me you'll never go awry. Stop Buying Things You Already Have - The problem with many people is that they tend to buy everything that they like - regardless if they already have it in abundance, which can be never a smart buyer's attribute. So what you need to stop carrying out immediately is stop buying the things you already have - remember there will be another day so you can purchase something new the next day.