Online shopping is the 'thing' these days and there are a plenty of websites that bait you to buy 30pcs 100% new and orginal 1N5241B In-line Zener diode DO35 11V 0.5W on the net, but there's zero that would guide you - giving out an overview of buying stuff online. Therefore , assuming that you've got all particulars packed about the need to is sold with goods online. Mathematics is never cool, especially for me - so for those like me or even otherwise I suggest you to understand the mathematics behind the discounts while offering. Take your time - understand the price, the discount and do several calculations; trust me you'll never get it wrong. Stop Buying Things You Already Have - The problem with many people is that they tend to buy exactly what they like - regardless if they already have it in abundance, which is never a smart buyer's attribute. So what you need to stop doing immediately is stop buying the things you already have - keep in mind there will be another day so you can purchase something new the next day.