first email from them:
To receive your promotion cash back check, you must submit, either by fax or mail, the purchase Invoice of your new HP Designjet Z2100 or Z3100 Series Photo printer along with the "Confirmation Email" to:
Market Velocity, Inc.
HP Extreme Upgrade Promotion
3885 Crestwood Parkway, Suite 500
Duluth, Georgia 30096
Fax: 770-925-9064
You are not required to ship your existing printer in order to receive your cash back check. However, if you would like to remove the printer, HP will assist in shipment of the printer, and pay for the associated shipping and recycling costs. Please send an email message to mailto:hpcustomerservice@marketvelocity.com to receive assistance. Once your purchase Invoice has been received and validated, shipping instructions and a shipping placard for HP's preferred freight company will be sent to you electronically. You must contact HP's freight company to schedule pick-up.
For a list of purchase options, please visit
http://www.hp.com/cgi-bin/united-states/re...n/howtobuy.html.
If you require further assistance, send an email message to mailto:hpcustomerservice@marketvelocity.com or call 1-888-593-3835, Mon-Fri, 8am-8pm, EST.
Thank you for using the HP Extreme Upgrade Promotion.
Customer Service Manager
HP Trade-In Program
www.hp.com/go/tradein