Well, "decent...." There's always that thing with any instrument to do with entry-level being totally shite and totally off-putting... Believe me, I've wasted a fortune discovering that cheap harmonicas are junk. I've tried everything, mate, and, without wishing to sound my own trumpet, I'm regarded as a bloke who knows what he's talking about...
If you want to put kids off for life, buy them cheap $5 harmonicas. They are not in tune. You will find one or two reeds minimum not correctly aligned. They are not properly gapped for good response. They go flat in a heartbeat.

You know that you have to pay several hundred for a good guitar, or violin, or mando. You know that you have to pay several tens for a decent recorder or whistle. But you think that five dollars is great for a harmonica. Well that's the "harmonica is a toy" syndrome. The tragic truth is that you can buy a brilliant harp for thirty quid/dollars. Yep, you have to train the novice how to not blow them out. But we either want decent harp players or we don't...