it's a tricky one Protea. I paid about £500 for my 12 x 8 but that is mill finish (plain ali ) so if it;s powder coated that will put the price up. As you say you're getting the staging louvres,& heater as well - Must be a good one for £300, there are loads of good ones for less than half of that.

1. Do you want/need it?
2. If you had the money would you pay £500 for it?

If the answer to the above is Yes & Yes well there's your answer. Try making them wait for an answer and see if the price drops a bit

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ntg

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