A week ago I didn't have a 3d printer. Not sure this is an essential 3d printing item, however apparently it's a limited time deal @ 20% off.
Sovol Filament Dryer, SH01 Filament Dehydrator 3D Printer Spool Holder, Dry Box for Keeping Filament Dry During 3D Printing, Compatible with 1.75mm, 2.85mm Filament and PLA PETG TPU ABS Material
Only goes up to 50C, so it's not the most versatile of options. Maybe okay for PETG, but I find that casual printing goes through PETG fast enough that additional drying is rarely needed. If I am not going to print for a while, I can just use a ziploc+silica.