well prices of the Gmat books vary from bookshop to bookshop. Midday bookshop in south ex Delhi provides GMAT books at very reasonable prices. In any ways you should buy the book because just a single book will give you access to all 6 cats. I guess price for one manhattan book can range from anywhere between 900 -1500 depending upon the shop you buy from. Gmat books available in Small local book stores are very expensive. but bookshops like midland provide gmat books at reasonable rates. if you order from amazon sc book will cost you 15 $ plus shipping.