Best to mention what area of Manhattan you are in, and which test you want done? You might try Manhattan Aquariums, they will run a couple of the tests for you, but do keep in mind that water testing - for all of the parameters can be time consuming.
API kits are fine (IMO) for ammonia, nitrites, nitrates and pH. If you are looking for Ca, Alk, Mg it is best to purchase your own kits as you will need them to monitor your tank as time goes on. Salifert is the brand most folks use.