Whether you want to go for a repair or a replacement will usually depend on the exact nature of your cracked screen, and you should ask around for quotes before making your final decision. Some may be able to give you a decent deal (close to $200), some higher, and some may say that the screen can't be fixed at all. But to give an idea of the costs for a new TV versus a repair, the 4-series 50" Amazon Fire TV is available for just $279.99, which is close to the low end of repair costs. On the high end, the LG C2 Series 55-Inch Class OLED is listed at $999.99. 
So if your cracked TV cost more than $700 and you get a quote close to $200, paying for a repair may be worth it. But if you've had your TV a few years and the repair quote exceeds a few hundred bucks, buying a new television is probably your most cost-effective option. That being said, it may be wise to wait for Black Friday, Super Bowl season, or spring sales to get the best price on your brand-new TV