Swapping out 6-speed Revoshift Shifters

[Sbloomer]

All these junior bikes (at least the lower end ones) seem to come with Revoshift shifters.

 

My daughter struggles to get into higher gears because her wrist doesn't seem to be strong enough.  I have checked the cables (and replaced them) and checked the rear derailleur.

 

So now I'm thinking of swapping out with 6-speed trigger shifters, but the only place I can seem to find them is on eBay.

 

Does anyone out there know where I can get locally (in Cape Town)?

 

Tia