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[napman]

ลองดู Vox ตระกูล DA 5,

I have this one too, bought it used from local private party. I like it a lot. Not as small as Pignose even if it has only 5 watts but you can set it at 3 different watt out. Nice size and weight to carry around, use 6 C size battery. A lot of effects to play around with and also have 2 jack inputs that you can use 1 for guitar and the other for mic.
Looked and felt very well-built, I have no clue how much it'd cost in Thailand, but I don't think it should cost more than your budget.
I strongly recommend this one, it's quite fun to fool around it especially all of those effects for this low cost battery-power amp

I also just purchased the Roland AC33 that came out not too long ago, it's quite much more expensive than Vox D5 but if you can afford it then may be better to have it now so you don't have to pay twice in the long run