I am wondering if there is any cheap option to send a box of personal belongings - books, clothes, other sort of things - to Thailand?

The box would weigh up to 30 kgs.

Any suggestions?

Have a look at sevenseasworldwide (Google it)

They quote £80 per 40 kilo "tea chest"

But, realise, also that the real fun will probably start at the Thai end, when (and if) the Customs take an interest in your shipment.

TBH, it seems to be more of a lottery than anything else

Good luck, and please keep us informed how you get on

Penkoprod

Have a look at sevenseasworldwide (Google it)

They quote £80 per 40 kilo "tea chest"

But, realise, also that the real fun will probably start at the Thai end, when (and if) the Customs take an interest in your shipment.

TBH, it seems to be more of a lottery than anything else

Good luck, and please keep us informed how you get on

Penkoprod

thanks, it does seem to be a standard 80 pounds for the shipment.

But 70 or 80 days seems to be a bit long as I would need those things earlier. But having no better options I have to use their service .