I am waiting for the day when I could purchase from the spatial outlet store online since I can't make to the conference.
Have you looked at the Esri store:
Yes I am more looking for shirts and other souvenirs.
Thank you for your interest in Esri promotion items. It’s wonderful to hear. However, at this time Esri does not have plans to develop an online store for promotional merchandise other than our GIS Day merchandise. Your feedback is being shared with appropriate parties so that this idea can be given proper consideration. So again, thank you for the feedback. Hopefully we can offer this service soon.
Thank you!