Some archival material on personnel losses of both sides.
Losses of the RTR 22 (22nd Coastal Artillery Regiment) probably including elements of RR2 attached 1-7 July 1944:
In all he regiment lost 136 men killed in action, 506 wounded in action and 194 missing, total 836 men.
Losses of the Finnish Cavalry Brigade (apparently without 200 Infantry Regiment) 1-15 July 1944:
Total 362 men, including 65 killed, 257 wounded and 25 missing.
The German 122 Infantry Division lost 205 men (36 killed, 168 wounded, 1 missing) during July 1944 according to Heeresarzt reports:
That contradicts to information on circa 600 casualties posted earlier in this thread, I can't say where the last came from.
From the Soviet side the staff of the 59th Army reported the following losses in ten-day and monthly losses reports:
Compiled from TsAMO f. 416, op.10453, d. 86, ll.2, 41-42, 86-89. That doesn't include losses of the Navy's personnel. Losses during the landing operation proper (1-9 July) are not easy to calculate precisely, but they can be estimated as ~3400 killed, wounded and missing. By the most modest calculations fighting on Teikarsaari and Melansaari accounts for almost half of killed.