I have just tried out the lab services provided by www.pharmacabinet.
com. I think if you have a simlar mindset as mine you would feel that
the money is well spent on the service. Here is what I did. I bought a
10 day supply of Lipitor 40 mg (10 pills) from an online pharmacy and
sent in 6 pills along with 6 pills of Lipitor 20 mg I obtained from my
doc as samples. BTW, I made the samples blinded to the lab (I simply
labeled them as Liptior tablets from source #1 and source #2). I
received the results back from the lab with the online purchase right
about twice the amount as the sample Lipitor (40 mg online purchase vs
20 mg standard). Immediately I followed up with a purchase for a 180
day supply at the online pharmacy from the same manufacturer (same
batch number - make sure you ask for the same batch number). I figure
my net cost saving for this transaction, minus the outlay for the lab
test, is about $280 for a 180 day supply.

My calculations were based on the CVS.com online price of $680 (for
180 Lipitor 40 mg pills) and the online pharmacy's price of $280 (for
180 Lipitor 40 mg pills). The difference of $400 is offset by the lab
test cost of $120 ($75 1st sample + $40 second sample +$5 mailing).
Hence, my net saving is about $280. I could have saved $560 for a 1
year worth of supply.

My plan is that as long as I can buy from the same online place and
from the same manufacturer for the same drug I have already tested
with pharmcabinet, I will take the risk of not testing it more than a
couple of times a year. For a new medication I want to buy, I will
adopt the above strategy: a small purchase first followed up with a
larger order, after the results coming back positive. I think this
will save me quite some dough over long term. BTW, I will recommend
the site to set up a customer blog so that good online places can be
shared among the customers.