！！
You don't find a good guy like that often!!
Literal
Like-that good man often-often exist-not [ぞ]!!
A compact emphatic statement. そうそう is an adverb meaning 'often, easily, so frequently,' almost always in negative contexts ('not often, not easily'). The structure そうそういない ('don't exist that often / are rare') is a common collocation. ぞ gives it masculine emphatic force. The sentence is short but packs a clear recommendation — praising a specific person.