Have you wanted to experiment with building your own LEGO omni-wheels?
If you’re competing in Standard League soccer, you’re only allowed to use LEGO-branded parts. That means a lot of third-party omni-wheels are not allowed. One possible solution is to build your own! Try searching for ‘Lego omni wheels’ online and you’ll find lots of resources to help you.
If you need to buy parts, try looking at Modern Teaching Aids or Bricklink to buy individual Lego parts.