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Follow ZDNET: Add us as a preferred source on Google.With robot lawn mowers, window washers, vacuum mops, and more, we're probably closer to the "future" we saw on TV than ever before. And while it's true the last decade has churned out plenty of fascinating and functional tech, it's fair to point out that most of it isn't cheap. Also: 5 smart home gadgets I consider completely non-negotiable - and whyRobot vacuum mops can climb well over $1,000, as can automatic pool cleaners, lawn mowers, and other self-cleaning systems. AI-powered video doorbells and security cameras often cost hundreds, smart thermostats can run similarly, and plenty of other common home tech has a hefty price tag to match -- before you even pay for any required subscriptions or plans. Also: I installed these smart window shades in 10 minutes - now I want them all over my houseThat means the most innovative smart home tech is often an expensive investment for many people. But we've tested plenty of gadgets that are under $100 and can still give your home a big upgrade. Here are the simple smart home gadgets we love for their elevated function and wallet-friendly prices.Simple smart home gadgets we love