Some time ago there was an enquiry if anyone knew a source for a garden fork in Phuket. I have tried all the hardware stores and the likes of HomePro without success, but maybe someone has had better luck and can point me to a real source,

If you have a Global house in Phuket, try there, our local Global house has them

Have you tried the big SuperCheap store near to the new long distance bus terminal?  I have see garden hoes, spades, etc sold there.  Can't remember seeing a garden fork though.

Try the Hardware warehouse just north of Heroines- they have tons of stuff in there.