I think double whatever the original buyer paid is reasonable.I saw a pap on e-Bay this morning with a BIN of $3,299.00 .The Paps are cute but they can't hold a candle to the Speedy based on the overall look.
"Reasonable" depends on the buyer. I know there has been a lot of talk about how overpriced the Miroirs on eBay are, but if there are buyers willing to pay that much for a hard to get item, then the price isn't too much. For some buyers it's like buying art...someone who collects handbags, or more specifically, collects rare LV handbags, paying double or more than double is probably not even something they bother to think about it...they may want the item no matter what the cost. I have seen a handful of beads, made by a peer of mine, sell for over $5000 on eBay -- if someone will pay that much money for beads to make into a necklace then surely they'll pay $3500 for a rare handbag.
If you don't LV or some miroir pieces left in your country ebay is the last chance. Don't forget that some sellers lives with ebay. It's a real job. I personally wouldn't buy it on ebay. I can't spend that much money but if I had the money I would as long as I get what I want