The best possible "deal" for a reasonable lighting system would be this:

By a MS 900 light head from geo man by itself for $45
By a MS 808 Tai Light "kit with battery also for $55
By a radio shack 4xAA batter holder - and necessasry connectors to connect to tail light jack - $<10

What you would have is a 900 lumen headlight using a 4x18650 Li Ion pack with charger, a 200 lumen tail light using 4xAA alkaline or recharge. and you could have all for less than $130 shipped -and

A 900 lumen head light - a 200 lumen tail light, an "all night battery if run on low, and a 40 hour battery for the tail light on blink and all for less than $130..........

Drawbacks, 900 lumen is really 600 lumen, and you have to know how to wire up a battery connector.