Some internet computer shop convert already to coin slot system or better known as Pisonet. Some are using new CPU casing with build in coin slot.
here's some picture below...
Specs:
- 4 digit dual relay timer
- 1 & 5 peso Coin slot
- w/ drawer and lock
- w/ 700 watts Fortress Power Supply
- Fits up to 15 inches Motherboard inside
- Capacity : Up to 2.5k to 3k coin fits on the drawer
Mechanism :
VGA will shut off after time is over - not the power source, so more safe and reliable than those Power Cut-off systems.