* Get them: This is the most common way to spell it, and it's used when "get" is a verb and "them" is a pronoun. For example: "Please get them for me."
* Get'em: This is a more informal way to spell it, and it's often used in spoken language or casual writing. For example: "I gotta get'em outta here!"
* Get 'em: This is another informal spelling, similar to "Get'em," but with a space between the "Get" and the apostrophe.
The best way to spell it depends on the context and the desired level of formality.