Packing Pictures For A Local Move

I will be moving to Isaan (call that local??) from Chiang Mai in a week. I have already hired Nim See Seng as the mover, and I need to pack everything for them.

I have five framed pictures, three of them very large (max 50 x 65 cm). I would like to get them packed in a single box, protect them with bubble wrap and let Nim See Seng move them in that single box.

QUESTION: Where can I take them to get packed? I read on this forum about a postal service company on Ratchadamnoen near the Montri Hotel (which sounds good) and complaints from some that they are very pricy.

I had the nutty idea of looking for empty TV boxes at Tesco or Siam TV, but I suspect they get broken down almost immediately.

I am in the Faham/Rimchok area and I can speak enough Thai to do the deal.