Outer Limits 4x4 Board

I have a Disco S1 the roof lining is starting to sag so after reading a number of posts on replacing the roof lining for around $200 I started dialling up some trimmers in Sydney metro area.

So far I haven't found one that will do it under $400 and it doesn't have a sun roof.

Appreciate if someone steer me to the right trimmers and price !

Thanks in advance.

Cool95