Based on my research, they say it is recommended to replace the full LCD and touch screen digitizer. While in theory it is possible to only remove/replace the top glass, there is a good chance the LCD underneath gets damaged while removing the glass.
That said, the BLU vivo 5R glass is available on amazon for under $50.. [https://www.amazon.com/V0090UU-Replacement-Display-Digitizer-Assembly/dp/B07411DB5M/ref=sr_1_7?ie=UTF8&qid=1515769722&sr=8-7&keywords=blu+vivo+5r+screen+replacement|check this out]
The local phone repair shops in the neighborhood mall should be able to help get this fixed. Their labor charges are around $60
Disclaimer: I haven't yet bought the digitizer or gotten it fixed, will do it hopefully soon...