The Zippy 700 LiFe's show up in stock now at the global HK warehouse.
41g, 700mAh, 6.6v, $6.00.
13g x 4 + harness so maybe 55g, 900+ mAh, 4.8V, $15.00 (Eneloop AAA)
Both pretty good choices, similar capacity/weight, both very inexpensive. 20 years ago, how much did a 225mAh Nicad pack cost?