Comedy-focused websites such as Txt2Nite.com and DamnFunnyTexts.com are good sources of funny text messages. Social media websites, such as the "funny text message" tag on Tumblr, are another option. Entertainment websites such as Buzzfeed and LifeBuzz also have many best-of articles on funny text messages as of 2015.
Facebook has a "Hilarious Texts" group that shares funny texts. Some social media websites have sections dedicated to funny texts; searching on your preferred site is a good way to find them.
Online SMS services directories such as TextMeFree and websites such as FunnyTexts.net provide free methods for sending funny texts online. To provide inspiration, these sites also host lists of funny text messages.