Hey Undertale fans! Official Undertale merchandise is now available for pre-order here
This is a combo of two t-shirts, a Mettaton poster, and stickers. You can purchase them individually or separately.
They'll start shipping them out in early December so it's best that you pre-order any of the merch soon (it's 5% cheaper to pre-order now than to wait).
Here's an official image of what will be available.