if you say "Did I really just try that?" it means you are surprised you attempted or did something you didn't expect you would. like for me saying "Did I really just try Balut?" "I really just tried skydiving for the first time" usually means a sense of pride that you are saying I was good at this and did it only this one time.

Ok commodity is a stock term meaning a share of gold, soybeans, corn etc.. In slang someone or something could be a hot commodity meaning they are rare or valuable Goods and merchandise are the same thing except goods are plural. Merchandise single or plural. Goods not used much in regular speech unless the term goods and services which usually means the price includes the product and other services. Also "the goods" is old movie slang" for something illegal. Another use for goods is the slang word goodies( which means usually snack foods, sweets,chips) anyone says you want some goodies usually means snacks.