Stop gap for what? Buy something good that will last. Use slickdeals to find a good deal. Samsung would be my recommendation.
https://slickdeals.net/newsearch.php?q=4k&titleonly=1
Any 2017 model 4K set by a major brand name will be fine, though I would avoid TCL, RCA, etc.
Here's an ongoing deal for a good 4K set that walmart has been clearancing. Type in your zip code to see if there's any $450 or less near you.
http://brickseek.com/walmart-invento...r?sku=52859178