IK Multimedia has launched a holiday promo called Happy New Gear, a sale where you can save 50% on all IK plug-ins and software until January 6, 2014.
Everything from AmpliTube to T-RackS to all of their virtual instruments. They're also offering half off the Total Bundles, which provide you with an instant collection of IK software in one purchase, the ARC System 2 upgrade (software only), and even the Custom Shop gear-credit packs.
To obtain the 50% discount, just select the product from the choices in the webstore or via the Custom Shop. Once selected, the promo code "HALFOFF" will automatically be inserted into the Promo Code field, discounting your purchase at checkout.
Please note Expansion Tank is excluded, but check out this Group Buy to save.