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This should probably be posted in a different forum like "General", but I don't know if/how to move it. In the right spot more people will see it and respond.

I guess cheapest depends on where you are. A search of the WEB shows several companies selling them in the US and a couple more in other places. I'm not an expert on exchange rates but they all seem to cost about the same with principle differences being (1)size (2) whether poles, line, etc. are supplied, (3) kind and number of collecting heads.

They're not hard to make but I'd suggest getting one pre-made first and then copying it. UV-stabilized material isn't cheap but you can probably make a 2 meter long Malaise yourself for a bit over $100 US if you have a sewing machine.