Why are mini BMX race bikes so rare?

I've recently bought my six-year-old a junior racing bmx and he's having a go at racing. Problem is, my four-year-old isn't happy with just watching his brother and he also wants to give it go. I think that's great. However I'm a bit uncomfortable spending another £260+ on a bike for a four-year-old. So I'm trying to pick one up second hand. But apart from the odd one on ebay, I can't seem to find any.
Does anybody have any ideas where else I can look?
Cheers
Does anybody have any ideas where else I can look?
Cheers
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If it doesn't move and should, use the WD40.
If it shouldn't move and does, use the tape.
Good luck on your decision
If it doesn't move and should, use the WD40.
If it shouldn't move and does, use the tape.