Proving yet again that sometimes little home-grown Web sites can outmarket the big guys, I spotted a totally stealable idea on PacificBakery's order page
When you click the button to submit your order, a little pop-up box comes up to upsell you, reading:Special!
= Available right now only =
Spelt White Cinnamon Raison Bread only $2.99!! (Regular price $4.99)
Then it goes on the describe the bread in glowing detail and features an "add this to my order" link.
The box has been on their site for at least a month now, so the whole "right now only" is marketing talk for "whenever, but please hurry" and I respect that. This is definitely an idea to test on your site if you sell things, especially products which once tested, could turn into long lifetime renewable sales. (I've bought more of the cinnamon raisin bread since.)