I am not sure where the last answer came from but Vineyard listing service shows for Oak Bluffs Average $909,636 ; Median $595,000 Lowest a condo for $175,000 and highest a waterfront property at $5,500,000. Currently 191 properties on the market with about a 1 year average days on market and a current market value in excess of $150,000,000. All figures come from below reference. You can write me for a password if you would like to gather the information yourself.

Check out this variation from the last year:

last year at this time:
Total Properties 9 Avg. 102
Lowest Price: $529,000
Median Price: $1,750,000
Highest Price: $4,500,000
Average Price: $2,078,444
Total Market Volume: $18,706,000

This year:
Total Properties 15 Avg. 106
Lowest Price: $359,000
Median Price: $490,000
Highest Price: $1,759,000
Average Price: $603,060
Total Market Volume: $9,045,900

More inventory this year and about the same days on market but there has been a drastic difference in prices which tells me either property values have dropped or the those in the higher price bracket aren't putting their properties on the market (waiting out the slump).

Hope that helps