Walmart offers the RCA 54.6" 4K Flat LED Ultra HD Television, model no. RTU5540-C, for $279.99 with free shipping. That's the best price we could find by $193, although we saw it for $30 less on Black Friday. It features a 3840x2160 (4K) native resolution and four HDMI inputs.
Uncle Sam could take a hefty chunk of your retirement income if you botch this.