1) Souvenirs:
Bird of happiness, matryoshka, samovar.
2) Matryoshka is so bright. It's a Russia traditional souvenir.
A bird of happiness is so small, but it's cheap too.
Samovar is so bright and original, but it's can be expensive.
3) Samovar isn't so cheap as a bird of happiness.
Matryosha isn't so small as a bird of happiness.
Samovar is so tradinional as a matryoshka.