At Pelican Parts they've got Porsche antifreeze for $37.50/gal. Mixed 50:50 with distilled water, for 6 gal of mix that'd be like $112 (ignoring the negligible cost of the water).
So how you coming up with $250? Is that for someone else to do it?
If so, it's not terribly difficult to do it yourself. There's lots of DIY guides right on this forum.
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