Hi @noncedosokana

Here's the ifixit Apple Watch Series 3 LTE Screen and Force Touch Gasket Replacement guide, that may help.

Here's what ifixit charges for the part only - not the labour to change it. ifixit doesn't do repairs.

Apple Watch (42 mm Series 3 Cellular) Screen

Apple Watch (42 mm Series 3 GPS) Screen

If getting it done by a professional repairer the cost of the part and the labour to change it, may depend on your location. Search for Apple Smartwatch Series 3 42mm (insert LTE/cellular or GPS) screen