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:
http://digi.narc.fi/digi/fullpic.ka?kuid=3408649
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:
http://digi.narc.fi/digi/fullpic.ka?kuid=3222461
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:
http://ww2stats.com/cas_ger_okh_dec44.html
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:
http://s49.radikal.ru/i123/1007/cb/159cc95d8399.jpg
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.