Well I might have gotten lucky on this one....Dropped the Mrs off at
the grocery store to pick up a few items and keeping with normal
practice started circling the store to entertain the three wee ones.
The middle one tends to get cranky if stuck in a parked car. (it's
worth the price of the gas to circle....trust me on this)

Came around the back of the store and low and behold there's a big ol
arched piece of plastic/lexan? leaning against a dumpster with a chunk
out of the corner. Looks like somebody at the tanning bed shack on the
end of the strip mall busted a cover to a tanning bed and there it
be... Not being one to pass up such an opportunity I grabbed it.

Since I'm only looking for a section that a 1/4" the bow of the over
all piece doesn't really matter.