The NTNUI shop has always been open a few hours every day at Idrettsbygget Gløshaugen. Sometimes these opening hours does not fit to your personal schedule. NTNUI main board, with a lot of help from Sprint, has made an online store where it is possible to buy all the NTNUI articles that are sold in the store. So, go and check it out!
Now that Idrettsbygget Gløshaugen is closed due to renovations, the NTNUI store has been moved to NTNUI Bumerang. The store is open when Bumerang is open, which is monday to friday from 17-18.
Bumerang is located here: https://goo.gl/maps/9hKjiVcvJgk