The widest selection of shops can be found on the city’s main thoroughfare Nevsky Prospekt (the Dom Knigi book store is especially famous), while Bolshoi Prospekt on Vasilyevsky Island is also well worth visiting. You will also find Vasilyeostrovsky Market there, offering fresh produce, fish, meat, sundries and much more. Other markets can be found at 3 Kuznechny Pereulok (Kuznechny Market) and 4/6 Moskovsky Prospekt (Sennoi Market). If you have the urge to spend, you could check out Passage
(passage.spb.ru), which is a beautiful shopping arcade that originally opened in 1848.
For more things to spend your roubles on, check out 10 things to do in St Petersburg for less than $20