Well, the phats are out so far - except those that will only be available at the party on Saturday (26th) beginning 15:00h GMT...
To get the birthday cake, you gotta give a Leet Doll - which you can buy at the special items shops where you can also buy a yalm - there's at least one such shop in Rome Blue and another in Rome Green.
The Manex headphones, Box, Ducky sleeves, top, pants and boots, and the special celebration dress (worker man's pants for male, white ballerina outfit for female) as well as the golf club can all be bought from the huge female Opi in white ballerina outfit in Borealis (forgot her name, will edit this post with the proper names posted).
And apparently there was a SNAFU regarding the acquisition of the glasses and balloons which are able to be bought via paidpoints only, but they aren't accessible AT THE MOMENT for fr00bs but will be in the next update, as confirmed by Kintaii, one of the devs. The "mea culpa" apology and clearing of this question was accompanied by the announcement that the paid points AI social clothing will be available for fr00bs as well in the next future. Smart FC, way to make some more bucks...