Lux Express bus company is running a short-term discount promotion. They're selling tickets from St. Petersburg to Tallinn, Riga, and Helsinki, as well as from Moscow to Riga, at discounts of up to 45%, reports Travel.ru.
Tickets are on sale until April 17, and travel with discounted tickets is possible until May 31. To receive a discount, enter the promo code SPRING on the company's website. Tickets are non-refundable; exchanges are possible for a fee equal to the fare in effect at the time of exchange.
Source: travel.ru