A bit old but Sakuya and Remilia Touhou plushies have been released to go along with the original Reimu and Marisa ones.
Don't get too happy though, as this is what heartnana said about availability...
Siblade - I see them all the time. However, They're usually about 12,000 yen apiece. Sometimes I see them at a "low" price of like, 9000 yen each. They're too rare and honestly not worth it for THAT much (tho they are awesome). I would have my own reimu if I could find them for a halfway decent price.
So yeah even in Japan itself you're seeing a base markup of 400% over the original 2900 yen or so price.
Good fucking luck :<
On the other hand though you can get a large yukkuri head for 1500 yen or so.
Now aren't you happy :V