Purchase any combination of two (2) A Designs 500 "EM" Series preamp modules and you will receive with your order an HR500 power supply to accommodate those modules at no charge! Every day pricing is $299 on the power supply, and there is no special code to use. Just order any combo of two. The offer is while supplies last or until August 31st 2008. That's $1590 for a stereo pair of high end preamps, with the ability to swap in the future of course. This offer is for USA customers only, no exceptions.