Your local hospital or pharmacy might be able to hook you up. Lots of meds come in refrigerated. I have an organ transport box that is perfect for a six pack and is a real conversation starter at parties!!!
It isn't Mr. Bean's from Rat Race, is it?
Funny you asked about styro. My wife is a pharmacy tech and asked me just last night if any fish nerds might be able to use the styro shipping coolers because she hates that they just get tossed. I was intending to offer them on the trading dock, with the caveat that I have no control over what size comes in or when. I would also mention that I have used them a couple times, and they are not waterproof. I took one to the mountains with me this past winter, and brought home a handful of fish in it. Water temp stayed real cold even though we had the heat crankin' on the 2 hour ride home. All fish survived, but a noticeable amount of water had soaked out the bottom. But it did hold most. I would think these would make excellent liners for a bigger, water proof containers that you place bagged fish in. And I don't know about their crush limit, but the ones I used were pretty solid, stronger than a box, I'd say...