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I have not been able to find a GFI outlet that is approved for connection to aluminum wire.
That being the case, you have a couple of options.
You can install a GFI breaker in the panel, and then use standard outlets (do this for any circuits needing GFI protection on them). This is the more expensive of the two options.
The other option is to pigtail short lengths of copper wire onto the aluminum wire. This is less costly, but must be done with approved connectors for copper to aluminum connections. I would be happy to post a link for approved connectors.
The approved connectors are kind of expensive, but not as expensive as GFI breakers.
One other thing to consider with the copper to aluminum connectors... they are rather large, and there may not be room for them in the wall box, behind the GFI outlets, which are rather large themselves, relative to the space they take up in a wall box. Please stand by for link for approved connectors.