Where to buy air bed/camping supplies

I’m travelling with my partner and have booked double rooms in a series of guest houses. Unfortunately, we don’t seem to be sleeping well in the same bed (we live separately at home), so I’d like to buy an inflatable mattress so I can sleep on the floor. Anyone know where I could buy one in Chiang Mai? Ideally I’ll get one by Saturday so I can take it with me on The Mae Hong Son Loop on Sunday.

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