Some other things to consider...
- Import tax, duty, customs fees etc. How much would actually save. Also, have a look at other countries, Korea, Japan, US, maybe the tax rates vary depending on trade agreements.
- potential defects, warranty issues, Buying locally can be more expensive but you also get someone a lot closer to deal with should any issues arise.
- weight/size. I purchased a 2.7m Korean inflatable and that's 40kgs on it's own. Add a 15hp motor and there's another 38kgs. Living in an apartment means 3 trips to the car, boat then motor then bits and pieces.
I don't think anyone would care if I took it on a city bus/subway but I couldn't imagine how. Intercity trains/buses would be OK as you generally have time to load/unload but how would you get it to and from the station, to the water.
If you want to look at the Korean market, maybe as another option or out of curiosity try
Obviously its in Korean but click on the links and the pictures are pretty much self exploratory. The first link, boat-korea is my local go to place.
고무보트 - Inflatable Boat
선외기 - Boat motor.