Sporty cars have been hot models for a while now since the weather turned, but models from one brand in particular are in heavy demand and short supply.

According to the May installation of Autotrader’s late-model and CPO scarcity reports, used sporty Subaru models are “hot with car shoppers, but hard to find.”

Since spring began, these lists have been dominated mostly by sportier models. In April, Porsche models topped the lists.

This time around, the somewhat more affordable Subaru sporty models took the front seat.

Autotrader senior analyst Michelle Krebs pointed out that Subaru has been one of the fastest growing brands in the U.S., with sales headed for their seventh consecutive year-over-year increase.

On the May scarcity lists, the two-seater CPO Subaru BRZ was the No. 1 hardest-to-find certified vehicle nationally.

“Developed with Toyota, the BRZ’s cousin is the Scion FRS, which did not make Autotrader’s national or major regional scarcity lists in May, suggesting Subaru has street cred that Scion lacks,” Krebs said.

And the late-model used BRZ came in at No. 8 nationally. The Audi TTRS topped the list for scarcest late-model used vehicle in May.

Autotrader also offered a few stats from their site that illustrate the supply and demand situation for the certified BRZ.

Autotrader.com showed 22 certified BRZs listed with a median price of $21,978 and median mileage of just under 18,000, with nearly 3000 searches conducted for the BRZ.

The CPO Subaru WRX sedan is also proving popular, coming in at No. 10 on the national scarcity list.

Autotrader had more than 2,200 certified WRX listings in May with a median price of $29,771 with median mileage of about 21,000, with nearly 16,500 searches done for the WRX, Krebs shared.

The pair of Subarus were also scarce in specific regions of the country.

For example, in New York, the CPO BRZ and CPO WRX were No. 1 and No. 2 respectively.

“In Boston, a popular region of Subaru models generally thanks to their all-wheel drive,” said Krebs, the BRZ ranked No. 5 and the WRX No. 6. In Philadelphia; the BRZ was No. 1 on the scarcity list and the WRX was No. 7. In Washington D.C.; the BRZ was No. 2 and the WRX No. 4 — all for the certified models.

The CPO BRZ also made the list of top 10 scarce vehicles in San Francisco-Oakland-San Jose (No. 6). The CPO WRX was No. 1 in Atlanta.

Through the end of May, Autotrader reported, Subaru has sold 228,083 new vehicles, which is up 16 percent year-over-year.

“That’s particularly impressive since Subaru doesn’t sell trucks and larger SUVs, which have seen large sales increases,” Krebs said. “Subaru’s goal is to hit 500,000 annual sales by 2016.”

But Krebs said the automaker’s success isn’t just about sales volume.

“The Japanese automaker spends the least of any automaker on incentives — the only one to spend below $1,000 per vehicle. Subaru’s turn-rate of vehicles arriving at a dealership and being sold to a customer is the fastest of under 28 days, when the industry average is 71 days, and falling, according to data compiled by Autotrader’s sister site, Kelley Blue Book,” said Krebs. “The quick turn of new Subarus may explain why car shoppers are turning to used Subarus, though even those are proving to be as elusive as new ones.”

To view the full May scarcity reports for CPO and late-model used vehicles from Autotrader, click below: