Flipkart rates.

2GB :
Sandisk: Rs. 159
Strontium: Rs. 150
Transcend: RS. 165
SP: Rs. 155
4GB :
Samsung: Rs. 195
Sony: Rs. 199
Sandisk: Rs. 195
Transcend: Rs. 190
Kingston: Rs. 190
Strontium: Rs. 165
8GB :
Samsung: Rs. 320
Sony: Rs. 315
Sandisk: Rs. 320
Transcend: Rs. 315
Kingston: Rs. 320
Strontium: Rs. 270

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Sandisk-For Mobiles.

Flash memory is a must for smartphones, tablets, and other mobile devices, and SanDisk's world-class, vertically integrated manufacturing ensures customers have the form factors and storage capacities they need. Reliable and cutting-edge, SanDisk embedded and removable memory is the choice of virtually every major mobile device manufacturer.
Best price in India at www.flipkart.com , www.ebay.com etc. 

Sandisk-SD Card manufacturers.

SanDisk, a Fortune 500 and S&P 500 company, is a global leader in flash memory storage solutions. Their products enable you to capture, share, preserve, and enjoy a growing world of digital content. With removable memory cards in cameras, embedded memory in smartphones, powerful memory solutions in cloud storage data centers, and more, SanDisk powers your smart digital lifestyle.
This is a goal and a tradition they have upheld for nearly 25 years, as they have grown from a three-person Silicon Valley start up to a global leader with more than 4,000 employees. Today, the SanDisk brand is recognized around the world, and their pioneering flash memory technology is integrated into products from top electronics companies and sold at approximately 2,50,000 international retail outlets
SanDisk creates transformational memory products at world-class manufacturing facilities that produce more than two million products each day. They serve three high-growth mega markets--mobile, computing, and consumer electronics--each of which increasingly requires flash memory to deliver compelling benefits to consumers and businesses.

SD Card bulk orders.

     Maximum electronic goods are made in china due to their low labor charges. Bulk orders can be made at very low prices at many websites. You can try this at http://www.made-in-china.com & www.alibaba.com etc.
     There's a good news,you can get SD Cards at a very low price(no need of bulk order) at flipkart( www.flipkart.com ) but this is only for people living in India.

About SecureDIgital(SD)

Secure Digital or (SD) is a non-volatile memory card format for use in portable devices, such as mobile phones, digital cameras, GPS navigation, and tablet computers.

The Secure Digital standard is maintained by the SD Card Association (SDA). SD technologies have been implemented in more than 400 brands across dozens of product categories and more than 8,000 models.

The Secure Digital format includes four card families available in three different form factors. The four families are the original Standard-Capacity (SDSC), the High-Capacity (SDHC), the extended-Capacity (SDXC), and the , which SDIO combines input/output functions with data storage. The three form factors are the original size, the "mini" size, and the "micro" size (see illustration). There are many combinations of form factors and device families.

Electrically passive adapters allow the use of a smaller card in a host device built to hold a larger card.

Host devices that comply with newer versions of the specification provide backward compatibility and accept older SD cards, but older host devices do not recognize newer cards. The SDA uses several trademark logos to enforce compliance with its specifications and assure users of compatibility. This article explains several factors that can prevent the use of a newer SD card:

• A newer card may offer greater capacity than the host device can handle.
• A newer card may use a file system the host device cannot navigate.
• Use of an SDIO card requires the host device be designed for the input/output functions the card provides.
• The organization of the card was changed starting with the SDHC family.
• Some vendors produced SDSC cards above 1 GB before the SDA had standardized a method of doing so.