I've ordered my pods
from reefcleaners in the past with good results. Not sure if they still carry the ones I got but it's worth a look.
I tried the "pod tank" for a few months and had pretty much no results. Had the filter, rock chaeto deep sand bed and put pods
in several times with out getting much out of it. Eventually took it down and used the stuff for the refugium on my 125g.
I did the pod tank cause I wasnt told when i bought my scooter dragonet that all they ate was pods
and was not sure if i was gonna be able to get him onto frozen at the time so i figured it was worth a try.
My mandarin and scooter are both happy and eat frozen very well, even pellets too. It's been over a year that I've had them and they have grown so much and gotten fat too. lol