Re: I think a price of under Rs.100 is a good start for most books. If you have rare books, then you can charge more. Basically, it depends on the buyers. Some buyers who are in urgent need of a book are willing to pay a higher price than casual buyers. So don't be afraid to experiment!
Re: higher the demand,greater is the price.It all depends on the mailers and phone callers who contact u.if u r not able to go for right price,then go for a bid option.