There are several one letter new gtlds that were listed in the Toby Clements newsletter today.

I.directory$6,250   idirectory.com is developed
X.estate   $5,000    xestate.com Buy Domains parked page
I.equipment$3,950 iequipment.com redirects to Tequipment.net
U.estate   $3,500     uestate.com does not resolve
U.clothing $3,500  uclothing.com is developed
N.clothing $1,300 nclothing redirects to nclothing.tumblr.com
F.clothing $1,300 fclothing.com is showing the index for its site
V.clothing $1,200 vclothing.com does not resolve
H.holdings $1,200 hholdings.com goes to a snapnames auction page

Remember these names have a premium renewal.