I think the answer is yes - lots of ads on ebay for relevant supplies.... i.e. http://cgi.ebay.co.uk/Compatible-Bulk-ink-Refill-kit-for-Epson-CX8400-CX9400f_W0QQitemZ350323645007QQcmdZViewItemQQptZPrinter_Accessories?hash=item5190ea9a4f
Note : May be easier for you to check your local ebay with search words <cx8400 refill kit>
Answers & Comments
I think the answer is yes - lots of ads on ebay for relevant supplies....
i.e.
http://cgi.ebay.co.uk/Compatible-Bulk-ink-Refill-kit-for-Epson-CX8400-CX9400f_W0QQitemZ350323645007QQcmdZViewItemQQptZPrinter_Accessories?hash=item5190ea9a4f
Note : May be easier for you to check your local ebay with search words <cx8400 refill kit>
Hope this helps