Xenforo is having a sale right now, instead of $140, the licenses are $125. Renewals are $35 instead of $40. Most of the official addons are also $5 off. If you need to renew your license, now would be great time. For those looking to convert in 2019, might be a good time to pick up a few licenses. Particularly as Xenforo 2.1.x requires the license to be up to date to update automatically etc.