I use a Velcro strap for mine.
I'm also looking for a cheap brushless setup
I’m either gonna get the Onyx set up from Horizon for like $80 or a cheap GoolRC type set up from Banggood.
the the Onyx set may be $20-40 more, but I like the idea of having Horizon warranty and customer support.
If you don’t like the Velcro strap idea, I’m thinking of making one out of clear Plexiglass for mine. If you like this idea, PM me and I can think about making one for you too.