Hi, I'm from Helen's DDC - the aforementioned dom user. That definitely helped, as did pinpointing the most likely source of the problem to begin with - a non-healing postpartum hemmorhage/retained placenta - and upping my iron to compensate. I supplemented with formula and bottles - I tried to use an SNS but found that DD ended up with more formula that way than she did with a bottle, and stopped nursing sooner each session because she was full faster. I got better results (ie, more boob juice into the kid) using a bottle because she would get as much as she possibly could out of the boob and I'd just top her up with the bottle afterwards. That also made it easier to ease off the formula, too. But, that's just my experience - I had no problem with her latch or her nursing, she just didn't get enough to gain weight, and the extra bit of formula gave her the energy to nurse well the next time.
I haven't read your other threads so I don't know - but do you know WHY your supply is low? Usually it seems there is a medical reason - PCOS, post-partum anemia/trauma, hypoplastic breasts... if you can figure out why you're not producing enough milk, it helps you decide when and if to give up. Hypoplastic breasts, for instance, are kind of a lost cause, all the domperidone in the world won't help in that case - but anemia can be cured, and PCOS-related supply issues also respond well to domperidone. I had a friend who had that problem and while she had to keep supplementing, the domperidone did get the supplementation down to a manageable level and she didn't have to supplement at night, which is the worst as I'm sure you know!
In my case once the anemia cleared up (about 4 months pp) I was able to exclusively breastfeed, although I remained on domperidone until DD was old enough to understand "Mummy's boobs just don't have as much in them any more" - which for us was 18 months. Thanks to good health insurance, the costs were covered, and it wasn't enough to be a substantial financial burden on us anyway. It was a pain taking pills 4 times a day, and I didn't get my period back until I stopped taking it.
Feel free to PM me if you have any questions, I"ll be happy to help where I can. And also - I'm sure you've heard this - any boob juice is better than none, and even if you have to keep supplementing, it DEFINITELY gets to be less of a pain later on.