$29 Molecule-R cocktail r-evolution kit (was $77)
Available on Groupon through Sunday
This kit comes with a bunch of additives in pre-measured packets and a recipe book so you can make crazy cocktails with foam and gel things and generally impress your friends as they get drunk.
Save the most impressive drink for last so everyone's like WHOOoooaaaaaa
Sign up through my link and I'll get some credit!