Make sure there's interest there, before you put in the $$!!!
Or you may be the disappointed one.
Not knowing the machines ... the $69 are they "good"? Sometimes low cost is great, sometimes a disaster!!
What about getting one now, and you sewing on it some to become familiar and know it's well worth it and will do what they need it to do. Then clean it up for Christmas, so it's just like new .... and purchase the 2nd one. (they'll never know the difference if you zip it ...... and you can give it to them knowing they are good to go, and you know the quirks about the machine!)
What a sweet Auntie you are! :)