Kafka, I see that you excluded eBay, but I won bids there last week for SGS's Empress Marava far trader and Gazelle close escort plans for $11 each ($5 combined shipping within the US). Right before that I saw a MegaSet-1 go for $26 plus shipping. Given their scarcity and the demand, I'd imagine that any "normal" source would already have a waiting list for them, leaving eBay as your best bet. Good luck in your hunt.
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Wendell (IMTU tc++ tm !tn !t4 !tg ru+ ge+ 3i+ c+ jt- au ls+ he)