Ian Cunningham, general manager at Castle Lotus, said it would sell one or two models that cost between £25,000 and 35,000 between now and the deadline of 24 December.
A percentage of the money made from toy models that are available online, priced up to £30, will also go to good causes.
Richard Morris, co-founder of TheGivingMachine, came up with the idea when he bought his own Lotus Elise from the dealer.
“We’re seeing a huge explosion in online shopping, and luxury purchases are no exception,” he said. “As we operate a percentage donation system, high-value products such as these could also raise a significant amount for UK charities and schools.”
Cunningham added: “We’re delighted to be involved in this initiative to help the wider community. Christmas is about giving.”