Thanks for the insight! I've checked everything on the manufacturer's website, there's nothing about refilling (probably because they want you to buy more of their expensive cartridges). I didn't buy it online though, I bought it at a local tobacco shop - it was the only e-cig I could find in a retail store around here (not counting the $100 pieces of junk they sell at kiosks in the mall).
I'm definitely going to order up some juice and try (very carefully) to refill the cartridges. Worst case scenario, I fry my $40 e-cig and am forced to buy a better one online. However, I work with electronics for a living so I'm confident I can do a refill without overfilling / frying anything.
I will post whether or not the refill works, if it does, I'll make a video so others can benefit