What are some universities in Finland that offer a bachelor's or master's degree in Library and Information Science?
Kirjastot.fi has compiled a list of universities and vocational schools which offer education in either librarianship or information science more broadly. Unfortunately the page is only available in Finnish, but it links directly to the websites of different schools that detail what education they offer within the subjects - https://www.kirjastot.fi/kirjastoala/opiskelu/.
At university level currently the most well-known places for information science are Tampere University, University of Oulu, and Åbo Akademi (which is a Swedish speaking university in Finland). Certain universities offer degrees (both bachelor's and master's) fully in English, with some giving possibilities for students to write their thesis in either English, Finnish, or Swedish.
Both Seinäjoki (SeAMK) and Turku University of Applied Sciences (Turku AMK) offer smaller study programs (comprised of 60 study points, essentially the length of a 'long' minor subject at bachelor's degree level) which are generally made to be completeable while working simultaneously. These programs are targeted at those looking to get a basic working education within library services. By the end they provide a diploma within the library- and information service field. Both of these particular options cost between 400-600 euros, while university education for bachelor's and master's degrees are generally free for Finnish nationals. Here are links to the SeAMK and Turku AMK diplomas.