There were a total of 7 engines sold with the Aerio, all of them 4 cylinder. All but one were gasoline engines, with a diesel engine available as an option in some markets.
A 4 speed automatic transmission was the standard in the United States, with a 5 speed manual transmission options.
Although most Aerios were sold as front wheel drive cars, there was a all wheel drive option in the United States.
The trim levels in the US are the S, which is standard, and the upgraded luxury GS. Cruise control and keyless entry are among the luxury features included on the GS trim. As of 2006, the new trim names were the Aerio and the Aerio Premium, which replaced the previous labels. Both included an upgraded sound system compared to their respective previous trim.
There is a modified version of the Aerio that has competed in the Pikes Peak hill climb. This model is called the Suzuki Aerio P950 Pikes Peak Special.
There are many good places to find deals on a used Suzuki Aerio. The first place I look is the listings on eBay. There is also Craigslist and your local newspaper classifieds.