Liberty Flights has always had consistently low prices. I've done a lot of business with them. Very pleased with their service although I can't speak for their DIY line. After reading several people's nic reviews I went with Wizard simply because they seem to have a solid track record for nic quality (in regards to purity). Cost wise, you get more for your money with Wizard Labs compared to Liberty-Flights.
In the shopping cart:
WL 36mg nic 250ml w/ no coupons or promotions =
$16.29
Shipping options (to 64119):
Parcel Post =
$5.55
Priority =
$5.65
Naturally I'm willing to pay a dime for faster shipping, so that brings my grand total to:
$21.94
Liberty Flights is currently out of stock on one of the the two nic base sizes they offer - 150ml and 30ml, both at 36mg. Currently I only see the option to buy nic base w/ VG @ 30ml - BUT let's play some more with the numbers anyway, estimating shipping costs using the available 5 x 30ml option since it's all I can add to my cart at the moment.
LF 36mg nic 150ml (after clicking the 20% off image) =
$12.39
Shipping (one option, to 64119) =
$2.99
LF Grand Total =
$15.38
A little more math using the above "to-my-door" Grand Totals:
WL =
$21.94 / 250 =
.0877/ml
LF =
$15.39 / 150 =
.1026/ml
Even with the sale LF comes out slightly more expensive which means if you find WL on a good (coupon code) day, you could get an even steeper discount on their already low prices.

Keep the deals cominG!