Missing cam connector bolt from IKEA? Email them

From IKEA website:

Request missing hardware

Are you missing hardware (such as bolts, brackets or pegs) to assemble your IKEA product? Let us know by email and we will respond in 24 to 48 hours.

Be sure to include your receipt number and the article number.

Be sure to include the hardware number found on the assembly plan.

No longer have the receipt, or it's over 90 days from the date of purchase?: IKEA does carry replacement parts for a majority of our products; however, we cannot guarantee availability. In most cases, spare parts are only issued for items that have damaged or missing parts upon receipt, if the return is made within 90 days of the purchase date.
If you no longer have a receipt, many of our store locations have bins of the most commonly used hardware in the Customer Service/Returns Desk area. Depending on quantity, charges may apply.

http://www.ikea.com/ms/en_US/customer_service/contact_us/hardware.html

The Home Depot carries only 1 type of cam connector in the stores.

Example cam connector from Amazon: