I had been taking Flax oil (I can't tolerate cod oil) but I just switched to Krill oil, and Vitacost was the place I ordered mine also.
I looked at the NSI one, and the stats they have on the bottle simply make no sense... compare it to every other brand and their numbers are VERY low, which isn't possible if it's 100% krill oil.
I know vitacost is the makers of NSI products, so they always try to push them on everyone (higher profit margin), but I went with this one instead: