Greetings...
I'll Assume $30 is a suggested amount. Since you gave no other info, I have 2 Suggestions:
One or the other AND Both.
Fixed Blade: Old Timer Capybara. Currently about $32 on Amazon.
Folder: Old Timer 29OT Currently about $25 on Amazon.
Both come with High Quality Leather Sheath,
Both are BEAUTIFUL with Rosewood and Ebony Rare Hardwood inserts, with Nickel Silver accents.
However, the most important is "The Story"!
You remove it from the box, and tell him that it's a hand-me-down from a long lost dead Uncle/Aunt/Cousin/Friend/Whatever
and that you just got it hand delivered by a one eyed man in black who handed it to you with a hand written letter and
NEVER said a word! Mysteriously, the letter disappeared in a puff of smoke the instant you had finished reading it!
NOW! Important! When you get it in the mail, Likely the Leather will be somewhat Desiccated. It's important that you distress it up a bit
and let it soak in 3in1 oil for a couple hours.
Optional - Use it to slice your finger slightly, and let a drop smear across the back. Make up a nice story that was in the missing letter...
Trust me, your friend will treasure it for the rest of his/her life!