Wanted: set of forks for my lads bike 24 or 26", 80mm travel

[redchris]

My biking knowledge is limited (hangs head in shame), so please forgive me but I'm looking for a decent set of suspension forks for my sons 24" wheel MTB. I know people have fitted 26" versions but will need to have no more than 80mm travel. Ideally an old pair of Fox floats would be great but they're getting expensive on the sh market nowadays it would seem. Thanks in advance.