All three Zellie books and the complete trilogy are now available in paperback at my CreateSpace e-store. Glimpse and Glimmer are also available at Amazon. Glow and the trilogy will show up there shortly. Barnes and Noble will take a few weeks to post, I’ll let you all know when you can get them there.
Here are the links I have at the moment:
Zellie Wells trilogy- CreateSpace
Also of note, there are lots of used copies floating around out there of Glimpse and Glimmer. $4.88 was the lowest price I found on both Barnes and Noble and Amazon.