Unfortunately I dont think you will find many karaoke type of places in Santa E,more of these 3 km up the road in Es cana.
Beer and drink prices vary as anywhere.Just wonder around to find what you are after.

As a guide (Es Cana prices 2 weeks ago).......

Beer 1.50 to 3.00Euro
Spirit + Mixer 2.50 - 3.50Euro
Bottle of Wine in hotel 5.90Euro
Soft Drink 1.50 - 2.00Euro
20 Royals 2.30Euro
50g Golden Virginia 4.50Euro
40g Domingo (local version of GV) - 1.85Euro

John.