I make my own, it seems silly to pay for it (I'm a chemist, but anyone can do it)
1) get a ziploc sandwich / food bag, pour in 20mls of deionised water (the type you buy to fill a steam iron or put in your car radiator). (tapwater wouldn't hurt, at a push. If you live in a civilised country)
If you want to, you can add a pinch of table salt. That's usually the only addition to bac water.
2)squeeze the air out and seal it. Place the sealed bag in a pint glass, and put the glass in your microwave oven.
3) Microwave it until the bag starts to expand, indicating the water inside is boiling. as soon as you see this, turn off the power
4) let it cool. You now have a sterile bag full of sterile water. Don't be tempted to open it.
5) hang the bag from a door handle with a clothes peg. wipe the outside with an anti bacterial wipe (like you'd use on an injection site)
6) Fit a clean needle on a fresh syringe, stick it through the bag, and draw out your water.
You know you can trust it, because you sterilised it yourself, fresh.
I often do this because I like my hcg more dilute than the 1ml they usually send out with it. I like to make 5000ius into 5ml, then inject 0.25ml or 0.5ml twice a week throughout my cycle, so my boys don't shrink in the first place. Since I started doing this, PCT has actually been enjoyable! The first day I take my tamoxifen, I can feel my balls getting all hot and itchy inside from my HPTA suddenly kicking back in, and they're all set to take up the slack.