EBay is absolutely the way to go for SmartMedia. Here in the United States SmartMedia has been phased-out too. But the new
STAGEA Electone was designed to use SmartMedia. Yamaha went with this media to take advantage of the built-in security ID in each SmartMedia chip. That way they can use it for copy protection schemes.
When I wanted to buy SmartMedia for use with my STAGEA I couldn't find anything retail locally. But on EBay you can buy all the SmartMedia you want for great prices!
Cheers!
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Louis Ewens
Founder, Electone Zone
http://www.electone.com