These are available from the US Mint here for $7.95.
Here is something I wrote comparing the 2007 First Spouse Medals and the 2007 $1 Coins . Now you can see the two coins together and how the wife medals are larger than the husband coins!
next up for 2008:
James Monroe, John Quincy Adams, Andrew Jackson, and Martin Van Buren
Elizabeth Monroe ,Louisa Adams, Rachel Jackson and Hannah Van Buren