Here's my suggestion;
If possible go with the setup Azimov showed...With splitting an SE pack and shoving it into an OGZZ. You'll double the voltage (vs. stock) and even though you have less capacity (only 70maH vs. the stock 100maH, or whatever the stock capacity is) you'll still have decent runtime if you charge it a couple/few times in a row.
I'm not sure what Az is offering for hookup with the batts, but I've got the following...
1/4aaa (1.2v @ 110maH) = $2 each
1/3aaa (1.2v @ 160maH, tabbed*) = $3 each
Then add the shipping cost, I do USPS First Class (real cheap for batts) or Priority Mail if you want it lickety-split.
Here's some pictures of the batteries:
Battery on left is stock ZZSE, the one on the right is 2 of my 1/4AAA sized batteries.
* Tabbed means it's got the metal tabs on there, ready to be setup for dual/multi-cell.