Rick Steves Guidebooks $5
Edited to add: I appear to have been too late. Most of the books are already out of stock.
FWIW, Rick Steves is having a guide book blowout - $5 for any guidebook. Hard copy only. Until 8/9 unless supplies run out earlier.
Note that many of his guidebooks will be updated later this year for 2021. And it's only guide books, not his other books on things like European art and the more general Europe Through the Back Door.
He's still paying much of his staff at least part-time wages through this entire mess. My guess is that many of them are kept busy doing guidebook updates that might have been put off for another year or so.
The worst decisions are usually made in times of anger and impatience.