They do have bigger than 2 ft size, up to 4 ft according to this online GEX catalog for 2009. GEX and Five Plan are the same company I think.
4ft dimension is 121.8 x 46.8 x 46 cm, weight 32 kg. Catalog price says 51450 Yen, which is roughly 792 SGD. That's probably including a stand and other things, but since I don't read Japanese, I don't know.
You can ask the lady boss at C328 for a price quote for larger GEX/Five Plan tanks.
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