If you need to buy an Ethernet cable, you’ll pay quite a premium for it at your local CompUSA or Circuit City. $22.99 for a 7’ Ethernet cable is terrible. For just a few dollars more, you can buy a 250’ roll of cable and make 35 of them yourself. You’ll need to invest in a good crimper and some RJ45 heads as well, but that cost is quite small compared to how much you can save by making your own.