You have two options for returning your MDPH2 for an MDPE10. 1. You send your MDPH2 to us at: Massive Dimension (Kalow Tech) ATTN: Matt Kent 155 Seward Road Rutland, VT 05701 Once we receive the system and it passes inspection, we will send you your MDPE10 at the discounted price. 2. If you want the MDPE10 before you send back the MDPH2 you will have to purchase the MDPE10 at full price. Once we receive the MDPH2, we will refund you your trade value once it passes testing. The discount you receive will be based on how much you paid for the MDPH2. For example, if you paid $5,499.00 for the MDPH2, you get that much off from the MDPE10 price. This amount excludes any shipping costs you paid. Validated through invoice or proof of purchase. Discount price will be $4,999.00 without proof of purchase. You will be in charge of shipping costs. As the customer, you will pay to get the MDPH2 to us. We ask that if you have the original box the system came in, that you send it in that as it provides the best protection. Shipping of the MDPE10 will stay consistent with company policy with free domestic shipping. International customers will have to pay for the shipping of the MDPE10.