You can get a brand new Voyage on Woot for $130.
https://computers.woot.com/offers/ki...lnd_cat_pc_5_3
But the battery is easy to replace on the Voyage.
https://www.newpower99.com/Kindle_Vo...ge-nm460gz.htm
The video there will show you how to do it. You can probably find the battery cheaper, however, on eBay. (Maybe not. Can't find any new ones on eBay right now.)