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The OC panels are usually available from commercial sheetrock/insulation suppliers. They are primarily used by the commercial building industry and hence OC doesn't give any info on their consumer website. I would recommend checking your yellow pages under Insulation Materials. Find out who the local OC rep is and contact them or locate one of the larger wholesalers in your area as they are usually the ones who stock them. The smaller outfits won't have them in stock and the hifi stores usually are a rip off in their pricing on items like these. The wholesale houses will usually sell to you if you explain what you are doing and beg....
They were a real pain for me to find also....good luck in your search...
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Best to you and good listening,
Several years ago I was successful in purchasing 2 inch thick 703 panels locally (in the Phila suburbs). I don't remenber the company's name but I placed calls to local O/C reps and they finally put me in touch with them.
I purchased an entire box of 2X4 foot panels, maybe 10 of them, but the whole box only cost about $65 and this is enough to make 20 1X4 foot panels which I placed in a light wood frame and covered with Guilford cloth. This cloth is VERY expensive at about $23/yard but decor issues with my wife dictiated its use.