I grow several very large containers of Gloriosas every year. The are over wintered dry in the basement here.
I attained a total number of tubers 400 a couple of year's ago and have since cut back on number of containers used for Gloriosas but still give tubers away every late spring. If you contact me next spring I'd be happy to send you a boatfull for postage. I'll note some links below here...