As an AI language model, I don't have real-time data, and prices may vary over time. However, based on my knowledge cutoff date in September 2021, here are some popular budget-friendly 50-inch 4K TVs from reputable brands:
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Xiaomi Mi TV 4X 50: This TV offers a 4K Ultra HD resolution, PatchWall UI with access to popular streaming apps, 20W speakers with DTS-HD audio, and multiple connectivity options including three HDMI and two USB ports.
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TCL 50P615 4K UHD Android Smart TV: This TV features a 4K Ultra HD resolution, Android TV OS with access to Google Play Store and popular streaming apps, Dolby Vision HDR, and multiple connectivity options including three HDMI and two USB ports.
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Kodak 50CA7077 4K UHD Smart LED TV: This TV offers a 4K Ultra HD resolution, Android TV OS with access to Google Play Store and popular streaming apps, Dolby Vision HDR, and multiple connectivity options including three HDMI and two USB ports.
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Power Guard PG50F4K 4K UHD Smart TV: This TV features a 4K Ultra HD resolution, Super Luma Ultra bright screen for flawless picture quality even in bright rooms, X-Motion Clarity, and features like Dolby Digital audio, Android TV OS with access to Google Play Store and popular streaming apps and multiple connectivity options including two HDMI and two USB ports.
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Samsung UA50TU7200KXXL 4K UHD Smart TV: This TV offers a 4K Ultra HD resolution, Samsung's Crystal Processor 4K for enhanced picture quality, multiple HDMI and USB ports for connectivity, and smart features with access to popular streaming apps.
Please note that availability and prices may vary depending on the location and retailer. It's always recommended to check the latest prices and features from reliable sources or directly from the respective brand's website or authorized retailers for up-to-date and accurate information before making a purchase decision.