I haven't been able to find any auctions for him alone- the sets of all 8 figures were going for $500-$650 I believe.
The 2 per box ratio has some benifits, but some drawbacks as well. Nice that you can build two landspeeders if you buy a box, but who needs two landspeeders? Nice that there isn't 1 or 2 that are singles in a box of 12, but not having extras of the sandtroopers or raiders is a bit of a let down.