As incentives this past month moved slightly higher after a recent low point, Truecar.com reported that shoppers may be spending a bit more at the lots as summer comes rolling in.

The site estimated that the average transaction price for light vehicles in the U.S. was $30,360 in May, up $595 (2.0 percent) year-over-year, and up $57 (0.2 percent) from April.

Commenting on the trend, Jesse Toprak, vice president of Industry Trends and Insights for TrueCar.com, noted, "Sales are continuing to rebound and consumers are feeling more comfortable buying highly contented vehicles.

"Toyota and Honda not only recovered from the last year’s dip in sales but also had their highest transaction prices ever in May, showing that they were able to recapture consumer interest in their products,” he continued, noting that two Japanese OEMs, in particular, are benefitting from the surge in new-car sales.

In fact, Honda saw the biggest rise in transaction price month-over month, climbing 1.4 percent, from $26,614 to $26,984 in May.

On the other hand, the only automaker assessed by TrueCar that saw a decline in transaction price month-over-month was Volkswagen, which saw a dip of 0.5 percent from April.

And one Korean OEM saw nearly a double-digit climb in transaction prices year-over-year for this past month.

Hyundai/Kia’s saw a rise of 9.2 percent, climbing from $20,329 to $22,196 this past May, according to TrueCar’s forecast.

Incentives See Slight Climb Year-Over-Year

And though the firm’s analysis suggests that incentives for this past month rose slightly year-over-year, the company reported they expect incentives to fall from April of this year.

Specifically, TrueCar estimated that the average incentive for light-vehicles was $2,392 in May, up $93 (4.0 percent) from May 2011 and down $49 (2.0 percent) from April. 

Breaking it down by OEM, the site predicts that Honda will see the biggest increase year-over-year, rising by 50.8 percent from May of 2011. That said, the Japanese OEM will see a 8.2 percent drop off in incentives from April, according to the site.

And for Hyundai/Kia, the automaker is predicted to fall off from last year, as well as month-over-month. The OEM saw a 20.5-percent decrease in incentives from May of 2011 and a 4.9-percent dip from April of this year, according to the site.

The site also provided the following charts to illustrate its forecasts: