The so-called antoninianus coin was first made of silver, and later bronze. It was worth 2 denarii, or 32 asses; it first issued in 215 AD. Despite its relatively short history (Diocletian discontinued the antoninianus in the 280s) these coins are numerous on the market today, and you can easily browse the antoniniani for sale here and pick out the ones that you personally fancy. Have fun!
“Antoninianus” translated for buyers
When looking through antoninianus coins for sale listings, note that non-English speaking sellers may refer to this type of coin in their native language. Some of the more popular ones are:
French: antoninien
Spanish: antoniniano
Italian: antoniniano
German: antoninian