Asking this for a friend in Korat:

Where in Thailand can I buy a lawn mover? Looking for a big expensive one that you can drive around with.

I can tell you where to buy one in Chiang Mai, any use to you ?

Asking this for a friend in Korat:

Where in Thailand can I buy a lawn mover? Looking for a big expensive one that you can drive around with.

A local golf course will give you info on where they have obtained 'Lawn Mowers' . When you said 'that you can drive around with' I presume that your friend is not wishing to use it on the roads as an alternative form of transport!

There was a 'Lawn Mower Racing Society' in the UK that used to 'soup-up' the engines and charge around on grass circuits in the UK, maybe your friend can start one in Korat.

We have a few outlets in Pranburi that sell large lawnmowers and if you want I can make some enquiries as to suppliers etc if that would be any help and your friend could contact them directly. Just pm me if you would like me to that.