Spa services on the Inspiration ranged from $90 up to $220. I'm not sure but I imagine pedicure and manicure services probably run around $30 to $50. The only alcohol I'm sure of is the daily drink specials which were $2.95 ($6.50 in the special glass). Hope that helps.
Call the spa daily and ask what the specials are. At the beginning of the cruise (Victory last week) a full body massage was $115 US. on the following Friday I paid $79.00US. An oxgenating facial was $90 I got it on sale on Friday for $69! I'm Canadian so I have to add 50% to each price!
Keep your eyes peeled for specials and sometimes they announce them over the ships PA system. Take and fix your own nail polish. Better yet give each other polish renewals.