rebait
A discount offered by a business or company to entice you to call or come in, so that they can then try to high-pressure-salesman you into shelling out for something more expensive.
I received an ad in the mail from a credit-card company offering me a low rate, so I phoned them to see about it. They said that the offer was no longer available, and then (unsuccessfully!) tried to pushy-talk me into signing up for a higher-interest card instead... classic rebait tactic, I guess.
rebait
A discount on worms/grubs/minnows at the tackle-shop.
My fellow teenage buddies and I occasionally help da owner of da local angler-supplies store by sweeping up a bit, shoveling snow, or babysitting his little ones, and so he gives us a 25% rebait on night-crawlers for our Saturday-afternoon fishing-trips.