New Alienware/Dell Trade in program

Dell has a new trade in program which looks to be pretty good and they accept all brands, not just Dell/Alienware. Quotes for Dell/Alienware products are very decent(I got $460 on my R2). They sent an email saying that they have a special $100 bonus offer on Alienware but the email offer varies from the offer on the site(the email says you can trade in any PC, the site says only Alienware PCs). Can someone please clarify what the actual offer is?  Can i trade in a Macbook and still get the bonus $100? The site doesnt say anything: www.dell.com/.../trade-in-program;l=en&s=dhs&cs=19&delphi:gr=true