Super-size cards - what to submit them in?

Does anyone have any advice on what to submit "super-size" cards to PSA for grading in? I know they don't recommend the use of 'top loaders', since they say that these permit the card to shift around, and potentially become damaged. I'm talking specifically about the R303 series cards, which are very thin to begin with, and thus could be easily damaged. They measure 4-3/4" x 7-3/8". I don't know if 'card savers' come large enough to handle these - does anyone else know? If so, where can they be purchased? Or any other suggestions on this?
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