Just for future References. I was looking for the big box too. I got mine from Silom Patpong Post Office the biggest is 55×100×55 or 150 cm Its big enough for moving or for Cargo. And the cost is 100 baht for the Jumbo Box.
If you are near to Home works and home probthey have smaller size.For round one's in various lengths, Zeen zone in Central Dept store sells. But in quantities and more varieties, let me know and I will refer suppliers to you as I buy them for packing to export.
Hi juanitabonita,
Welcome to expat-blog!
I created a new thread from your post along with a feedback you have on the Bangkok forum.
You will be more likely to search for information on this topic.
Cheers,
Bhavna 
i-Store Self Storage shop @Silom have cardboard box size 55x55x53 cm. Price 60 Baht.
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