If you know the brand/maker, email their customer service and ask. They will tell you if and where it is still made, or even if it's just changed names.
You could try calling the company (e. g. nestle, mars, cadbury), or check their website for listed products. Some specialty candy stores sell rare sweets, too.
The easiest way to find out if that candy is still being made is to search for it on a search engine. See what results come up and do a little investigating. If you have not seen it in 20 years then it may only be available from the company that makes it and not in any stores.
If green apple licorice does not appeal to you at all entertainment-articles/green-apple-licorice-not-your-moms-candy-anymore fence and have not yet made the candy
