Nichia 119 is rated for 700mA. Actually, quite a good deal getting 80lumens + 92CRI for $1.30.
The driver can simply be 2x7135 chip for 700mA single mode.
A cheap $2 AAA host here for a limited time: Deal alert: Mini Lumapower for $1.99 at Tomtop .
With some mods, that $2 host, $0.40 2x7135 chip, and $1.30 Nichia 119 = $3.70 80lumens 92CRI mini light. You do need one 10440 battery though.