Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is St. Moritz (72% of total searches to Valtellina). The next most popular destinations are Bormio (13%) and Livigno (11%). Searches for hotels in Celerina/Schlarigna (5%) are also popular.
KAYAK users have found double rooms in Valtellina for as cheap as $96 (St. Moritz) in the last 3 days. The average price is $572.