Did the same thing, bought a disposable, it was actually a bit strong for me, but was enough to convince me to get a kit from Walmart. Bought the original starter, one of the batteries would not even screw into the pack charger, both batteries would die within a very short amount of time.
Decided to take it back to Walmart once I got my ego-C Twist, and the first Walmart said they do not accept returns on tobacco products??!?!!?! Um, what tobacco? Apparently Walmart has taken it upon themselves to deem e-cigs as a tobacco product, bending the meaning of the phrase. I took it to a second Walmart and this time let them know that no one or policy informed me that I could not return he product within 30 days. He was nice enough to give me my refund.
I will admit that I did like the size of the blu cigs, but carts were very inconsistent, and the batteries just a plain disappointment.
If you want to try Blu, do not get them from Walmart, as they will most likely not refund your money.