ZGEMMAS come with a basic openatv image and with a certain amount of faffin will work.
If you buy a box and go for a ready made build such as Wooshbuild then by following the guide you could be up and running in 15 minutes.
Then for the SLY channels get some tests from the General Satellite Section request thread and purchase one you are happy with.
All done for less than £130 and it will work !!
You will also have learn't about the box during the setup process as well.