Heated water baths?

[ffutures]

My school needs some more thermostatically controlled water baths - temperature range from room temperature to say 80 degrees Celsius, capacity at least 8 litres, capable of maintaining temperature for two or three days without going wildly wrong. They are VERY expensive from laboratory suppliers, e.g. £200 plus, but lab suppliers tend to have inflated prices.

Are there any alternative uses for this sort of thing I'm missing, where there might be cheaper water baths available? About the only thing I've come up with so far is yogurt makers, but they have a fixed temperature. Also aquarium heaters, but the temperature adjustment tends to be a fairly narrow range. Any other suggestions?

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[ffutures.livejournal.com]

Forgot to add that there's a guy on eBay selling new Chinese 2.5L water baths for £100, but they're too small for my needs (we'd really like another 8 litre one, and another 4 or 8L one) and I get a bad vibe somehow, not sure why, and would be a bit dubious about doing business even if they were bigger.