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There are lockers at the train station in Garmisch-Partenkirchen, as mentioned here: https://www.bahnhof.de/bahnhof-en/Garmisch-Partenkirchen-3805998 There are no prices on that page, but usually a small locker (hand luggage size) costs 3 - 4 Euros per day, and a big locker for a checked-in luggage size is around 5 - 6 Euros per day. However, as soon as you open it, you have to pay again, so you need to take everything with you that you need during the day.