Quoted from j_m_:they've always sold the pro translites and gave them away as launch party prizes
however, if you wanted a premium or LE translite/backglass, you had to provide proof of ownership. this is the reason why so many MET owners were scrambling to purchase the premium translite from marco's when they had them available. the only other time I've seen them is on ebay when an owner was selling off theirs
replacement LE backglasses were only available as a exchange for a damaged or destroyed backglass. I believe that they actually had you send in a good portion of your original as proof that it was destroyed (eg. you accidentally dropped it
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