Last I was there was 2003..May have gone up a bit..
Depending on who you know, you can either pick up hotel for anywhere from $70 per night to about $150 a night depending on how well you wish to stay.. We had the Americans coming over for 10 days at $60 per night, but that was through friends..That was at the American Hotel in Sunabe... Probably can get close to same still.. Nice Hotel, just a little old, but well maintained..
Usually the association will help you around some, depending on if they know you or your Sensei (in your case, absolutely no problem). About maybe $1300 for round trip in advance (of course flights have gone up since then)
I was getting Gis from Shurei Do back then at $120 full embroidered, but we again had discount.. figure $200 now without..
$20 a day for food ... Drinks aren't cheap.. Anywhere from $6 to $10 for a beer in a bar.. Best is to have hook ups in a organization and they help with that through their American GI students.. If you go out with Shinjo Sensei bring $100 anyhow.. $70 for the drinks and Karaoke and $30 for a Taxi... Better is double that..But you will drink for free at the Hombu before you go out.
If you really are going, tell Rick Sensei ahead of time and I can get you hooked up... Need about 3 months to make preparation on their end..