Hopefully, you can find yours. If not, there is also eBay, though pricey (considering you can get the entire unit for $68.+$20. shipping). Currently:
$79.99 buy it now or best offer (holder only).
$59.95 buy it now (with tank).
$75.00 buy it now or best offer (with base unit).
I've had good luck with "best offers", even at 40% less $.