Not necessarily. It still can be a bit cheaper.
The nuvi 203 is not recommended for motorcycle use. Although I know some people use them on bikes. But then you have to spend some $ on bike mount and cover as the nuvi is not waterproof.
In case of the 276C the problem is the memory cartridge which is very unusual (not available in TH at the moment) and expensive. Similar thing to SONY: interface cables, batteries or memory cards
I am glad that Garmin changed this policy in other models.
So, in your case you would have to spend about 6.000 THB on the memory + map update. Or .... 7.900,- for not motorcycle friendly nuvi 203 + mount + case + time to make it work together

. Or ... time to change the unit.
I just got the zumo 660
