Once it's sold out, the price will jump up over retail, usually 10-20% in the first 30 days.
at 2 years you should be looking at an additional $1-200 per set.
Bricklink sales data can be used as proof if you want to go search for it.
This is the truth. My wife loves Harry Potter so I was working on different deals on the (current) HP sets and didn't have stupid Hogwarts Express. Immediately following the discontinuation of the set from lego.com meant the set jumped from ~$80 to >$120. If you think that's bad, take a look at previous runs of HP sets- most notably the Harry and the Horntail[brickset.com] set. Retail for it was $30, with only 265 pieces. Closed auctions on ebay are north of $150 (in fact an active one for $165). It's the only set with Mad-Eye Moody and a dragon. WTF LEGO!
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