Haven't come across similar forums for other makes (BTW Porsche also offers ED) but you might want to visit the boards at edmunds.com here or Bimmerfest here to see how BMW ED buyers negotiate things. Basically BMW (and I bet the others) have separate ED dealer invoices that are less than the US dealer invoice that you'd use in negotiating the best deal. Many folks doing ED on BMWs have been able to end up paying around $1000 or so over ED dealer invoice, which represents upwards of 8-9% off the MSRP, more on higher end models. Remember too you're not having to pay for a rental car in Europe (have you priced them lately - yikes) and you'll be in a nicer ride while you're there then you could ever afford renting. That plus free tickets and wow. Plus for the moment Volvo has a deal where they will zero out the cost of premium packages on some models, or throw in business class air if you buy a package tour featuring a Formula 1 race on the continent someplace... shoot, what's not to like?