What is the average supply cost for the part "hot spring dodger dim light"?
average supply cost refers to avg(ps_supplycost); part "hot spring dodger dim light" refers to p_name = 'hot spring dodger dim light'
SELECT AVG(T1.ps_supplycost) FROM partsupp AS T1 INNER JOIN supplier AS T2 ON T1.ps_suppkey = T2.s_suppkey INNER JOIN part AS T3 ON T1.ps_partkey = T3.p_partkey WHERE T3.p_name = 'hot spring dodger dim light'