I bought a Sandisk 16 GB dual head USB about a month ago.I bought it for Rs. 540. It gives you 14.3 GB of storage in actual.
The build quality of this usb is very good .It has a good tranfer speed.It is very useful to use with the mobile .You can connect directly it to phone without any otg help .This is a dual head usb so you can also connect it with computer through the other head.The transfer speed to the usb is always above than 30MBps. Once I dropped it into water, I dried it and still is working. So I an completely satisfied with the product. Those who are looking for a good buy for a usb drive should definitely go for this.