Spares or parts are always a necessary expensive part of owning a bike. Mini-bike spares are no different, and you need to ensure your bike model has these in plentiful supply.
Exotic models or rare imports can be hard to track down for spares.
Be aware of this when buying if you want the kudos of owning a rare bike or unusual model, the flip-side of this is in repairs or tracking down unusual mini-bike parts. However most mini bikes and popular models have spares in huge numbers and are easy to replace, but think carefully on the bike you require before buying.
Turbo minibike.
Dirt mini bikes
The mini dirt bikes are in stores and online shops. You should be able to find whatever brand of dirt mini bikes you could ever wish for. Ideally a used mini dirt bike gives you a lower price when shopping, but whatever mini dirt motor bikes you decide on; have fun and wear your helmet.