Spares for B3 can be found, B4 was a big step up, you will find good secondhand B4's and they may be stronger than the cheaper plastic Rats but they won't be cheaper. Lots of B4's are now mid motor wonders much liked on UK tracks (astro or grass not dirt).
There is a list of approved motors & batteries, may not apply at club or bashing level but at regional & national meetings it will. Brushless is almost fit & forget so a good investment (RTR mostly have mild motors suitable for starters, upgrading will involve a new esc as well as motor). lipo's can be run, charged (less than 1 hour) and run again, you can almost manage with one battery, they do need respect and looking after.
2.4g radio gear is now cheap & common, no more crystals. You will use up tyres & break a few wishbones, you & the kids will have fun and they may well be quicker than you expect.
At a club like Eden Park you will may need a transponder to record lap times & will need BRCA membership sooner rather than later.
This is the best forum but real best is asking question trackside, and you can look at the kit. Lipo batteries and brushless motors have made it easier, cars are now overpowered and driving skill and setup is what you need.
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