If you're interested in a high-priced, ultra-luxury hybrid, October may be the time to act. High-end gas-electric cars have been among the slowest selling vehicles during the recession. Automakers have built a new batch of 2010s, but in many cases, the 2009 models are still on dealership lots. In order to clear them out, they're offering unusually heavy incentives.

Edmunds Auto Observer reports, "Toyota Motor Corp.'s Lexus premium division, owner of the market's most-expensive hybrid in its LS 600h L, rang in October with a bulging $10,000 dealer-cash incentive on the '09 model of the flagship hybrid." Be prepared to deal with aggressive salespeople: the company is offering a $1,000 bonus to any associate who manages to sell an LS hybrid this month. Hybrids lower in the Lexus lineup are also seeing discounts, though nothing as severe as the LS incentive, and the company isn't offering bonuses to dealers who sell those.

Lexus isn't alone. The Cadillac Escalade Hybrid is also available at a serious discount. Autoblog reports, "Signing on the dotted line for General Motors' top-of-the-line 2Mode hybrid 'ute will cost you from about $73,000 to over $87,000... minus a five-digit discount, of course." The Chevrolet Tahoe and GMC Yukon full-size hybrids are each available with a $6,000 rebate in many parts of the country.

The slow sales of luxury hybrids may be troubling news for other automakers as well. Mercedes-Benz will introduce its first-ever hybrid car, a gas-electric version of the super-luxe S-Class, next month. BMW is reportedly developing a hybrid edition of its own 7-Series super-luxury car, but has not set a timetable for that vehicle's release.

If you're in the market for a new car, check out the U.S. News rankings of this year's best cars as well as this month's best car deals.