As noted below the online auction house 'Gotta Have It!' featured an Elvis memorabilia auction ending on March 25 with more than 400 lots. Highlights in this auction were the blue/gold jumpsuit from the Madison Square Garden concert, the white grand piano that once stood in the music room in Graceland and a combination of a black pants and shirt that Elvis use in his free time. The auction ended with results far higher than anticipated. Many items were sold for a price over the estimated values. Somewhat surprisingly Elvis' white Knabe Grand Piano attracted no bids at all.
Worth noting are:
Madison Square Garden Jumpsuit
Estimated value $150,000-$200,000: Sold for $212,588
Black Pants and Shirt
Estimated value $9,000-$10,000: Sold for $33,152
Silver and Turquoise Stage Belt
Estimated value $10,000-$12,000: Sold for $24,906
14KT Gold and Diamond Owl Ring (shown right)
Estimated value $7,000-$8,000: Sold for $40,388.40 / € 29.733
Elvis wore this Owl ring a lot in December 1970 however Elvis eventually tired of it and gave it away on a whim to his record producer Felton Jarvis.
The strange 'Guitar Pillow' shown below with Elvis' signature went for $1,200.
Go here for some great pictures and more details

(News, Source;EIN/ElvisMatters)