I am trying to book a ryokan in Miyajima and found that japaneseguesthouse.com prices are higher than what is being offered via booking.com and japanican.com. Are all three sites reliable? For example, I am looking at booking two rooms for 6 people at Iwaso. Japaneseguesthouse.com quote is $500 more than the quote from japanican.com. Both prices are for 2 rooms with breakfast and dinner included.

I offered my thoughts on your other thread:
First Trip to Japan