Just don't buy an el cheapo off-the-shelf frame from Michaels, Ikea, etc., the poster will look like crap. The paper will be wavy behind the glass (or more likely, plastic), the hardware for hanging will be terrible, and the overall quality is garbage.
Usually, I get mine mounted on mdf like Troutman.
Costco does it, but I can't remember if they do large posters (18x24 is the biggest I've had them do, if I recall.)
One word of warning, however: if you're moving or need to move the mounted poster around or store it, and you accidentally ding it (say on the corner) you're kind of #### out of luck. So invest in some bubble wrap and a glue gun and make some triangle corners.
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