We strive to maintain our price as low as possible. Further, to our already low price, we offer 5% discount on each part when you buy it as combo of Frame+Motors+ESC+Propellers.
Check this page for available combo offer on multi-rotors
http://www.vibranthobbies.com/combo-packs/for-multicopters.html

Also, we provide multiple choice on Motor,Esc, Propellers etc., and you are free to select according to your budget.
Please see the below product page to know, what we mean;
http://www.vibranthobbies.com/bumblebee-st450-quadcopter-combo-discount-5.html
We are working towards offering more choices on all the items.

This offer (5% discount) is valid till 15/12/2014.
We are unable to provide price of the combo item here since the price will vary according to the option selected.

Your suggestions are welcome.

Kumaran