Before you buy, make sure you have a toner vacuum or at least a very steady hand. Toner powder is finer than beach sand and twice as messy!

Amazon and eBay are flooded with options. This is where you’ll find the best prices, but be sure to read the reviews—look for terms like "low waste" and "high density" to ensure your documents don't come out looking like a charcoal sketch.

You don’t have to settle for pricey, brand-name plastic cartridges every time. If you’re ready to refill, here is where the pros go: