For a standard "off-the-shelf" option, a 28"x34” frame with a 24”x30” cut mat is the way to go. You can even get one with the mat already included that will fit your 24"x30” print.
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The following options will give you a look similar to the photos in our shop listings:
PVC Frame with Plexiglass Front
MDF Frame with Plexiglass Front
MDF Frame with Plexiglass Front
If you want to frame your print without a white mat around your print, then all you need to do is purchase a standard 24"x30" frame, like the ones listed below.