Hw much is the lcd and touch screen fon an acer E3 phone

Check on eBay and also on Amazon.
If the glass on the front of the phone is broken but the picture still looks normal, then you probably only need the digitizer.
When you find the replacement screen/digitizer you need, make sure you get one that comes with the proper tools to do the replacement.
Just the digitizer with tools to do the repair for most phones can be had for $11-$20. Both the digitizer and screen together cost quite a bit more than just the digitizer--up to $60 or more, but it's usually not as difficult to install.