The original panel is out of manufacture, so you might need to find a broken unit for parts if you cannot source a compatible screen. The most important aspects are the physical dimensions, resolution, and connector types when looking for an alternative display to install.
I did find one listing on eBay for this laptop series, but make sure this panel has the same size, resolution, and connector type as yours before ordering anything. When i was browsing the discontinued listings, I saw there were a few variants of the panel used and they are mutually exclusive.
https://www.ebay.com/itm/NEW-DISPLAY-FOR-ACER-ASPIRE-8930G-LAPTOP-LCD-SCREEN-18-4-WXGA/312290299933