Depending on the shipping costs to where you are another option would be a used very good Aura off of eBay ($55). Some here have bought from this seller and been quite happy, although I have no experience with them myself...
https://www.ebay.com/itm/Kobo-Aura-D...jHUogBCEH52XdA
Not sure what a screen costs or what's involved with swapping it out (hardware wise should be pretty straight forward if you find a screen, but IIRC something has to be done with the waveform too???)