Divan Mattress Shop?

Hi, I had a very stout table I couldn't use anymore (on the right) so I sawed the legs short and now it's going to be a divan, just need a mattress for it, the firm kind that one can sit on without smashing it. I can go to Baan Tawai but am wondering if there is anything closer to Sansai, near or in town. A friend mentioned the train station road but can't remember exactly where. Luckily, my divan-to-be is exactly the same size as one I already have so I shouldn't need to have a mattress custom made.