We can enjoy a variety of services about car in Japan. In winter season, you can rent a snow tire in a few days instead of buying them (link, only written in japanese but you can inquery them with English, Spanish, and Chinese). If you are living in heavy snow area, you can rent them in a season (link, only written in japanese). But wait for a second. You can use these services when you have 4 stud style hub between wheel and hub, this configuration is popular among japanese car such as Toyota, Nissan, Honda, and so on. As you know, MCC Smart have 3 stud hub, so you cannot rent these services. ( You have 5 stud Mercedes ? It’s worth trying to talk with shop guy, I think… )
Anyway, I have to change my tire to snow tire. I’ve purchased snow tire with reasonable price from shop (link). I’ve purchased 4 wheels of Mastersteel’s WINTER+ 175/55R15 77T and it costs about $160 and attached them to my Smart. 175/55R15 sized tire have different size from standard size of Smart, but I feel nothing strange about.
Enjoy your winter.