I just received an email from Fictionwise anouncing that they are offering a 60% Micropay (their own currency for later purchases) rebate for all ebooks purchased before 25 Jan 2008. They say it is in celebration of their delivering one trillion words mark.
For those of you that use their eReader format, they also offer an additional 5% rebate. (Fictionwise owns the eReader format.)
No special codes are needed. The only requirement is that you pay for it with a credit card or PayPal. (You can't get the Micropay rebate if you pay with Micropay.)
Fictionwise