Budget Travel - Need help planning a trip..Tokyo to Jakarta

I want to spend under 700USD for the flight. I found Singapore to Jakarta at 68USD, but I'm having trouble finding NRT to SIN . Anyone have any other suggestions getting from nrt-cgk under 500usd? roundtrip..dates are 3/10/08 - 3/20/08
Dates are flexible +/- 2 days

under $500 INCLUDING taxes?

That would mean you're after a sub ¥40,000 ticket (taxes are rarely included on published fares)

http://www.iace.co.jp/english/tokyo/
Has ¥53,000 tickets from Tokyo to Jakarta for your dates - the taxes will make this more expensive - but should be under $700 for a ticket.

There's a list of consolidators for you to try here:
http://www.flyertalk.com/forum/showthread.php?t=323865

no1-travel may have cheaper tickets to Bali about a month before your date - they currently have tickets for ¥44,000 (tax excluded) for travel from Tokyo to Bali in the next few weeks. They do have ¥33,000 tickets to Singapore available now.

Anyway, you have a list now - I'll let you do the leg work.