I have several different CF cards that I just listed on eBay. I've been using them with my C860 (which will be on sale soon as well) with no problems.

• Socket Serial I/O : Item 280432403747
• Socket Low Power Ethernet : Item 280432405788
• Socket Bluetooth : Item 280432399225
• Symbol Wi-Fi : Item 280432401040
• Targus 56K Fax Modem : Item 280432407478