how cheap, how old and what spec can he work with? i have some fairly old ones, pentium 4 or celeron or something im not sure, needs power supply!!
in fact, now im looking, i have three. ones a Acer C111 tablet-bit small, ones an Acer TM244lc - battery knackered needs power and the other is an Acer 3683 buti think that needs a new screen but works ok lol...