Price markup / down?

[HBELLC]

I have a question, is there a contribution that will allow us in the back-end section once all products are loaded to have the ability to raise the prices by a certain percent during holidays, black Friday, etc?

I was using a store years ago that was not zencart and i already forgot the store type i was using, but it had a part to allow us to add 15% markup to all products in the store meaning with a simple click all products were raised 15% more and once that part was done we can reduce it to say 5%. etc

I am using 1.3.9h and will stick with it due to 1.50 isn't compatible with most contributions that was created for other versions.

Any help or guidance would be most appreciated.

Thanks

[stevesh]

Some ideas here:

http://www.zen-cart.com/forum/showthread.php?t=79927