Underground Express Souvenir Shop is a centrally located store near Boston Commons, offering the largest selection of Boston souvenirs. Visitors can find a wide variety of items, including T-shirts, hoodies, sweatshirts, key chains, coffee cups, and postcards, as well as souvenirs from MIT and Harvard. The shop also provides services like luggage storage, stroller rentals, ear piercing, Western Union, and check cashing. Customers appreciate the affordable prices and the extensive variety of unique and fun items available. Many express their enthusiasm for the friendly and helpful staff, who create a welcoming atmosphere without pressure. The store is described as quirky and charming, reminiscent of local shops in big cities like New York. While it may be a bit tight and not wheelchair accessible, it is conveniently located near popular areas like Downtown Crossing and the Theatre District. Frequent visitors, including those from out of state, highly recommend Underground Express as a must-visit place for anyone in Boston. With its great selection and good prices, it has become a favorite for both tourists and locals alike.