Amazon’s Big Spring Sale has brought a $30 discount to the company’s upgraded e-reader, the Kindle Paperwhite Signature. It’s down to $160 instead of the $190 list price for Prime members. That’s not an all-time low (we saw it drop to $125 for Prime Day last July) but still a decent discount on a device that doesn’t go on sale very often. Engadget’s Nathan Ingraham called the Paperwhite Signature the “best e-reader. Period.” when he reviewed it upon its debut a couple years ago.