It's time for Danbooru's annual Winter Sale. From now until January 1st,
- All registered users get unlimited tag searches.
- Gold and Platinum upgrades are 25% off. Gold is $15 and Platinum is $30.
Unlimited tag searches means you can search for an unlimited number of tags at once. This is free for everyone until January 1st, but you need to be signed in to your account for this. If you don't already have an account, you can sign up here: https://danbooru.donmai.us/users/new.
Remember that Gold and Platinum are permanent lifetime upgrades. They're not monthly subscriptions. You pay once and keep the upgrade forever. To upgrade your account, go here:
The Danbooru Winter Sale will end on January 1st (11:59PM on December 31st, UTC time).
Updated