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SHAVING WITH DULL blades can be a real nuisance to your skin by causing nicks, cuts, ingrown hair and significant irritation. But just as overused blades will wreak havoc on your skin, buying replacement blades can do serious damage to your wallet, especially if you want to stick to the better brands. Our advice? Stock up during sale events while refills are cheap, like right now as Amazon is offering huge markdowns on Gillette refills for Prime Big Deal Days.

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Part of what makes Gillette such a stalwart razor brand is the transparent amount of options to match all types of skin and preferences -- and Amazon is offering massive deals on all of them. For those who like a heavy-duty shave without any irritation, there is the Gillette Fusion5, with its powerful five-blade design engineered with the blades closer together to reduce any tugging. Right now, you can grab eight replacement blades for 33 percent off.

If you prefer the feel of three-blade razors or are especially prone to razor burn, there is the Mach3 Sensitive with enhanced lubricating gel strips to minimize irritation and protect sensitive skin. Not to mention, for October Prime Day Amazon is, ahem, shaving off 30 percent on a huge 20-pack that could last you well over a year.

There is even a combo option, also at 30 percent off, including both GilletteLabs' exfoliating razors and rapid foaming cream for a precise shave with no sticky residue left behind. But don't wait, with discounts like these there is no telling how long inventory will last.