When To Shop
The moment most people start to look for an SFP module is when one of them malfunctions and fails to keep sending the information as it once did. Although this notion seems great, buying a module when it breaks may not be the best thing for you, mainly because you may wind up paying more for a module than if you had bought it sooner. Instead, you want to wait till the product is showing signs of wear and tear to buy because then you'll have lots of time to search through different company catalogs for specials and save a few bucks in the process. If you buy a Cisco GLC-T transceiver, you're going to pay for the price the dealer sells it at, whether or not it's on sale, because you need the product to continue to help operate the servers. If you decide to wait till the last minute, you could end up purchasing a product at a greater cost and from a company with a less than respectable lineup of transceivers.
What to Look For
You want to refrain from ordering from the OEM, and instead look for alternative devices that can do the work you need without the higher cost of the original manufacturer's devices. If you want to save even more on these modules, you could look for companies that offer huge discounts on their aging product lines, but that means buying something with older features. While buying two or three-year old devices is a great way to save a hefty amount of cash, it does entail a big disadvantage when getting Cisco SFP transceivers because of the outdated features you may no longer need. If you want to save money, it is far better to order products from a third-party dealer than from the actual manufacturer, which normally charges larger fees.