The political ads are over, so now we can be bombarded with ads for luxury cars during the holiday season.

Car shoppers will see so-called “loyalty” and “conquest” discounts in this year’s holiday sales campaigns. These deals essentially reward consumers for shopping the competition, even if they intend to stay with the brand they already drive. For example, a customer who owns a Mercedes could get an additional $750 discount for agreeing to buy or lease another. If the same owner went to a BMW showroom, he or she would likely be offered a similar amount to switch teams.

About 20% of shoppers on Edmunds.com who looked at a Mercedes C-Class during the last week of October also looked at a BMW 3 Series, according to data from the site. Among those considering the 3-series, 10% looked at a C-Class, and 10% looked at the Audi A4.

Dealers say discounts specifically tied to retaining existing customers have an impact. “It gives us something else to discuss, to look at a customer and let them know they are special to us,” says Robert Camastro, owner of Mercedes of Danbury, Ct.

The loyalty and conquest discounts vary by model and brand. Some Audi dealers are advertising discounts of up to $2,500 if you are trading in a rival luxury brand.

Lincoln, a brand of Ford Motor Co., is offering no-money-down lease deals on its MKX sport utility. Cadillac’s deals vary, but the brand is offering no-money-down, $399-a-month leases on its just-launched ATS model, which is designed to compete with the 3 series and Mercedes C Class.

It’s interesting to see Lincoln get in on the action, as their ad looks very similar to ads for the other luxury brands, but they need to do something.