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.