(June 1, 2011) SANTA MONICA, Calif. — Increased demand in response to high gas prices — compounded by supply shortages — is making it harder to get an incentive-laden deal on a small car, according to Edmunds.com. Edmunds' analysis of the True Cost of Incentives found that manufacturer incentive spending for compact cars fell 23 percent in the last month, and incentives on subcompact cars fell 14 percent.