Online shopping is definitely the 'thing' these days and there are a plenty of websites that appeal you to buy 3pcs/set 90 Degree 1/4 Hex Shank Drill Bit 5 Flute 12mm 16mm 19mm Woodworking Chamfer Counter Sink Chamfering Debur Countersink via the internet, but there's none that might guide you - giving out basic principles of buying stuff online. So , assuming that you've got all facts packed about the need to components goods online. Mathematics is never cool, especially for me -- so for those like me or simply otherwise I suggest you to understand the mathematics behind the discounts and offers. Take your time - understand the cost, the discount and do some calculations; trust me you'll never get wrong. Stop Buying Things You Have already got - The problem with most of the people is that they tend to buy exactly what they like - whether or not they already have it in abundance, which can be never a smart buyer's feature. So what you need to stop performing immediately is stop purchasing the things you already have - bear in mind there will be another day so you can buy something new the next day.