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where to get my shock over hauled
Sealed unit, I don't think you can overhaul them.
Its not made to be rebuildable, some can do it anyway. You might wanna look at the shocks from Yss:
http://www.ebay.com/itm/Suspension-strut-Gas-pressure-Yamaha-DT-125-R-/172665725646?hash=item2833ade2ce:g:tNcAAOSwCU1YruJV&vxp=mtr
Theres also secondhand ones, but they're probably worn and "tired" aswell.