Traveling to Tokyo

Flights to Japan from North America and Europe in late August are usually priced between 1,000 and 2,000 dollars (USD). 

Hotels range in price, of course, but good, clean accommodation can be found at prices ranging from 8,000 to 15, 000 yen (100-170 USD). Many hotels offer special rates through Expedia and other online travel services.
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*The Shibuya Tobu Hotel may be offering a special through Expedia.com and Hotels.com during the week of the IMS10 (less than 100 dollars US for a favorably reviewed 3 star hotel, but more on this later). 
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Here is a small sample of the range for hotels (with reviews) near Aoyama Gakuin (much of this information has been culled from Expedia.com and Trip Advisor).
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Low Range:
Hotel Asia Center of Japan. 10 to 15 minute walk to Aoyama Gakuin.
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Mid Range: 
Shibuya Tokyu Inn. 10 minute walk to Aoyama Gakuin. 
APA Hotel Nishiazabu. 20 minute walk to Aoyama Gakuin. Taxi   
  fare: 7-10 dollars (US).
Hotel Mets Shibuya. 10 minute walk to Aoyama Gakuin.
Granbell Hotel. 10 minute walk to Aoyama Gakuin.
Shibuya Tobu Hotel. 10 minute walk to Aoyama Gakuin.
Shibuya Excel Hotel Tokyu 10 minute walk to Aoyama Gakuin.
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High Range:
Cerulean Tower Tokyu Hotel. 10 minute walk to Aoyama Gakuin.
The Westin Tokyo. 20-30 minute walk to Aoyama Gakuin. Taxi fare: from 9-12 dollars (US).