Recommended places to buy Micro-T Micro-B upgrades from?

Hi all,

I'm coming from a TRX4m background. Looking to get into a little buggy. I've previously purchased a lot of products from Injora for the TRX4m. Even though they tend to sell a fair amount of products for the Micro-T and Micro-B, I was wondering if there are any good alternate places to get upgrades from?

Also in terms of a brushless motor upgrade for speed, are there any recommendations that people are flowing too?