For Garmin GPS you can contact the local dealer for it.
NaviCom Technology Pte Ltd
200 Jalan Sultan #10-03
Phone: 65 6296 8238
Fax: 65 6295 0996
Hand held can use for driving but not recommended because you will not be able to see the the screen clearly as it is usually smaller than vehicle type and you need to place it at a location with much clear view of the sky in order for the antenna to get many good satelite signals.
confirm.. i shipped my gps receiver from USA.. bought from ebay is still cheaper than what ALL shops in sg is selling. leading shop in sg selling for $249SGD.. I got it at $145 SGD.. delivered right to my doorstep!