In an effort to personally bankrupt me, Retopopu has announced a secondary popup merch line with company Arma Bianca (twitter, website) between Dec. 9th and Dec. 22nd with a line-up including t-shirts, hoodies, bags, and towels.
Few other details have been announced (such as prices or if these will also be available for sale online), but I will update this post if I hear anything further!