While people might associate Altoids with the classic red box of peppermint lozenges, there are actually multiple flavors, such as wintergreen, spearmint, and cinnamon. As a brand, they also make sugar-free Altoids Smalls, made with sorbitol and sucralose instead of sugar (via Amazon).
Some other Altoids products did not do as well as the classic mints. In the early 2000s, the company produced Altoids Sours, Altoids Gum, and Altoids Breath Strips, none of which proved popular enough to last. The Candy Encyclopedia by Fandom reports the gum was discontinued somewhere around 2010. The claim appears to be corroborated by Amazon reviews, with commenters lamenting in 2010 and later about the discontinuation of the gum. Kiddle reports that the breath strips stopped production in 2007, and product listings on Amazon note they have been discontinued. Altoids Sours were pulled in 2010 “due to low national demand,” according to a Wrigley statement cited by Bustle
However, the sours have a cult following. Fans buy them on eBay, and the demand is apparently so great that unopened tins of Altoids Sours have sold for upwards of $100, with even empty tins selling for $12-$25. Altoids social media pages receive comments asking for Altoids to bring back the sours. As Facebook user Robbie Harris notes, “Unbelievable, Altoids can’t make a single post without at least 3 people bringing up sours. Also, bring back sours.” There’s a Facebook group devoted solely to bringing them back, and one determined fan even started a Change.org petition in 2013 for their return, though it only received 174 signatures.