24 x 1 or 23 - 549 tyre help

Have recently got my youngest son a Triban 3 Junior and i am looking to get some better tyres than the stock Kenda Koncepts it came with. The sizes are 24 x 1 or 23 -540 only ones i find surfing the web are the Kenda's or schwalbe wheel chair tyres, I'm looking for something reasonably puncture proof as its not that easy as i have already found out twice, managed to get some innertubes but tyres struggling with. Has anybody had similar issues and managed to find something different in the past.
Too many bikes according to Mrs O.
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SJS Cycles seem to do Schwalbe Marathons in 25-540, but very pricey. Hope this helps...
Although these a advertised as wheelchair tyres, I've got the 700x32 version on my singlespeed and they're great. Mine are the folding versions and only cost a tenner each from Planet X though, so these wired versions seem overpriced to say the least...