As I have written in my mail, I liked your collection and although the books are reasonably priced it is the delivery charges that is quite high. I hope you will look into the matter as such costs may discourage the book lovers out of Bengal.
Also you may mention the tentative date/ week of delivery vide e-mail/sms.
Apart from above your delivery is fast. I have seen a part of your collection and they seem quite good. So, please keep up the service and cater to lakhs of Bangla book lovers.