Phoenix has a used one for ~700.
Occasionally they pop up in the EE for less than that.
I had looked the same as you if you could replace the grips. This is going back about two years ago and I couldn't find any replacements. The grips are also the weak point of the gun, as ian_in_vic mentioned.
Note the differences in the Marks (From Wikipedia, the trash bin of knowledge). If you have choice, my gut would say go with a MkII:
"The Colt Double Eagle is a double-action, semi-automatic pistol manufactured by Colt's Manufacturing Company between 1989 and 1997. It was available in standard full-size, as well as in more compact versions, features a decocking lever, and was chambered for several calibers. The family of models was known as the Series 90.
The design of the Double Eagle was based on the Colt M1911 pistol. Magazines are single stack and are identical to magazines shipped with the M1911. Most of the Double Eagle models were available in stainless steel only, however the "Lightweight" Officer's had an alloy frame and blued slide.
The slide used a version of Colt's series 80 locking firing pin safety, but unlike Colt's series 80 pistols, the Double Eagle Officer's model in .45 ACP held an 8 round magazine.
The Double Eagle was chambered for several calibers; among the more common are .45 ACP, .40 S&W, and 10mm Auto. Occasionally one will see a copy in 9mm and .38 Super. Similar to the M1911, Colt offered, in addition to the full-sized version, the more compact Commanders and Officers versions. The full-sized version was chambered for .45 ACP and 10mm Auto, while the Commander model was chambered for .40 S&W in addition to the other two calibers. The Officers model was available only in .45 ACP. Former gun writer Dean Speir once described a 10mm round which exploded due to an improperly cut chamber.[1]
Colt also redesigned the trigger mechanism and added a retaining plate due to some shooters having problems with skin being pinched by the top part of the trigger, as well as some springs and pins only being retained by the grip panel. The result was the Double Eagle Mark II."
YMMV.
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