For kids, kits are just great learning tools. And yeah, it's an absolute shame so many of the great kits have been discontinued. I think all of us should seriously start a petition to send to all the RC manufacturers to start selling more kits. This hobby began with people buying RC kits. Not RTR crap.
Traxxas, Horizon, and so many of the big names out there have done away with their kits, and to me, that just shows how the world has changed. Kids these days aren't learning the skills they'll need to do well once they get out on their own. They can't cook, fix anything, or figure stuff out for themselves. I just noticed Horizon did away with the SMT10 builders kit




It's a damn shame I tell ya. But I am serious... someone needs to send these clowns a message. Bring back the kits.
Ok, I'll get off my soap box now.
@Zerksies
For a $300-$400 budget, that's not putting you in a very good place to buy a durable basher, especially for big jumps and skate parks. Any decent kit will be close to that price. So that leaves you RTR.
I have no experience with the CEN Racing monster trucks, but I have always thought they were great looking trucks. And they are pretty cheap.
https://www.cenracingusa.com/products/qx4-hl150
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https://www.cenracingusa.com/products/8960
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These are brushed vehicles, so that is a downside. But for a 6 year old kid, I couldn't imagine these not putting a smile on their face. And even brushless electronics in RTR are usually crap anyway, so why pay extra for it?