Nice job on that review, Sense Field. Since there was no date on the video, I don't know if the review was done yesterday or months ago. But since anyone reading this will assume it was made around the date you posted it here, I feel the need to set the record straight on a few things, with those folks in mind. I hope you don't mind.
First off, I bought my Joye cartomizers and the PCC (carrying case with charger built in) to go with them at the same time last month from Cignot.com. It only holds one battery and one cartomizer, though, with two shorter slots for atomizer and cartridge. I guess they're trying to accommodate both types. But it is definitely available. At least it gives you the option of carrying a spare battery and spare cartomizer in the carrying case while you have an active battery and cartomizer in use.
Secondly, the cartomizers are available pre-filled, in regular and menthol, in several nicotine strengths. As far as I can tell, the e-juice inside is Joye brand, as the pre-filled cartomizers are factory sealed and labeled. Again, I get mine from cignot.com, so I don't know what other stores offer.
Thirdly, we have GOT to kill this myth about requiring a syringe to fill them! I've made several posts in this thread and others explaining how to fill with either the so-called "condom method" and by just dripping into the battery hole of the cartomizer, which is the method I use most and strongly prefer. I've been using the syringe method, just to be sure it wasn't vastly superior, and I promise everyone that it is NOT. Using the syringe to refill them requires not only the syringe, which isn't something most people have around the house, but you have to remove two pieces of the mouthpiece then puncture the fill port with something sharp but sturdier than the syringe needle... pant! pant!... before you can even get to the part of drawing your e-liquid into the syringe then finding the little fill port with the needle, and making sure you don't put in too much or put it in too fast... pant! pant!... and then putting it all back together and putting the syringe away safely, etc. Screw that! Just take your drip bottle and place a drop on the hole in the threaded end, wait for it to soak in, drip again, repeat as needed, and in a minute you've refilled it. I recommend about 16 drops this way. It's quick, easy, and the least messy method I know of. You'll want to let that juice soak into the filler inside for at least a half hour before using, giving it time to absorb. If you accidentally overfill it, remove it from the battery, and blow a short burst or two through the mouthpiece, like a whistle, into a tissue to blow out the excess liquid. Then wipe everything dry, including inside the battery fitting, before trying it again.
Fourthly, I would heartily recommend the Joye 510 and prefilled cartomizers to any newbie just starting out with vaping. Once you get the hang of it, you'll easily start refilling your empties as I described, and off you go!
And here's a strong warning: the first sign the juice is running dry is a bad taste. You'll get a taste that's either weak or tastes burnt. STOP RIGHT THERE! If you continue to try and get those last few drags, you'll end up putting a permanent burnt taste in the cartomizer. If you go too far, it'll taste like burnt plastic, and you may as well throw that one away and start a fresh one. But if you baby it, and don't try to vape every drop, you can refill these things many times and they will still work great and taste great.
And I urge against trying to get too much e-juice inside, whether on the first fill of a blank or a refill. It's far better to start off with about 12-16 drops of liquid per fill, then as you get more informed and more accustomed to it, you can find the upper limit for yourself, but it's really not worth it. If you overfill, you'll end up sucking nicotine juice into your mouth, and that's the better of two problems. The worse problem is that you'll end up leaking juice around the seam where the battery fits to the cartomizer, which is quite messy, and juice will leak into the battery, possibly shorting it out. With even the small Joye 510 battery costing around $12, that's not something you want to do. I've learned this the hard way.
I hope this helps.