Where can I purchase a DC/AV cable, the one which connects the main screen with the secondary screen?

The DC/AV cable can be purchased for $12 from Curtis International Ltd. Please mail a certified check or money order (payable to Curtis International Ltd) to 315 Attwell Drive, Etobicoke, Ontario M9W 5C1, ATTN: Customer Service Department. Make sure to include your name, complete mailing address, phone number with area code, model number of the unit and part required.