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The price 200 for 4 18"x 18" squares is insane considering it is temporary decking.

KwikDek is about 7-8 sq ft...

http://www.dngpools.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=KD

http://www.advanceddecking.com/KwikDek.html

Yes, this particular brand is ridiculously expensive. But decking tiles are pretty awesome, especially if you want to build a deck without a permit and without technically violating any codes.

It's even cheaper to build your own decking tiles. It's a lot of labor to build, say, 12"x12" tiles such as the ones you'll find at stores, but you can build 4'x4' or so pallet-type tiles by lining up a row of 2x4s (or fancier strips of hardwood, if you prefer) and screwing them into a couple of crosspieces. Think back to making popsicle-stick rafts -- same idea. In most jurisdictions, you need a permit for either a roofdeck or a patio that attaches to your house, but it's pretty hard to cite you for setting tiles or pallets on your roof or in your backyard. It's legally no different than setting flowerpots or chairs on your roof (provided it's safe and you aren't friends with people who are sue-happy).

I'm in the process of building a non-permanent deck for my flat rubber roof. I'm making 4'x4' pallets. That way, they're large enough that they can't blow away and won't require as much labor as smaller tiles, but still small enough that they can be carried down the stairs without dismantling them, which makes them transportable objects rather than a structure that could only have been assembled up on the roof. I'm making large, sturdy planters to lines the sides of the deck instead of building railings, again, because planters seem to be a perfectly legal item to have on a roof without needing a permit.