Aren't your ponies taking to the frozen mysis?
I just checked around online and seems like live pods
are a ridiculously lucrative business.
There's one guy on ebay selling them, and he get $50 + $35 s&h for 50 bugs... that works out to $1.70 each!!!
(Dang! That means I've probably got several hundred $$$ worth in my little 10gal refugium alone.)
I also found a place that sells a breeding kit for amphipods with everything to get started for about $40 & s/h at http://www.ipsf.com/#anchor45957
Looks like they have discounts if you buy more than one kit, or combine them with other livestock purchases.
While it's not live pods
, I also found two other seahorse food options on ebay.
One is live rotifers for $38 here: http://cgi.ebay.com/Roti-Feast-Rotif...QQcmdZViewItem
The other is a bottle of arctic copepods (dead) for about $30 here: http://cgi.ebay.com/Arcti-Pods-Real-...QQcmdZViewItem
I took a quick glance back at your SH thread, but I didn't see anything there about a refugium...
If I were you I would go grab a cheap 10gal tank with hood for about $20, stick a handful of pod-filled cheato off ebay for $8 in it, and grow your own... heck, make it a fuge for you horsey tank.