I too used to rely on the iD slips from XP as one of my “go to” diapers. I went through many cases of iD slips. After XP got sold I was worried that the company Gary made great might not be the same, so I shopped around a bit just in case. I too tried northshore diapers. They are very close in all respects, however the northshore padding seems to be a bit stiffer. Not by much, but enough to notice.
It’s always sad to see a good diaper become unavailable; however, there are other choices. I haven’t bought iD slips in a while now because I have switched to Betterdry diapers, which are available from Northshore. They are a bit thicker than the iD diapers. The plastic is softer, the leak guards are redicously tall, and they do swell nicely when wet. The only downside is if their tapes get too “stressed” they tend to start to unstick. I’ve only had them pop off once, but they have gotten close quite a few times. The trick is, since the Betterdr’s have front and rear elastic waistbands, is to not tape them too tightly. The elastic will take up the slack of taping them a little looser, and will absorb some of the stress of moving around; this way the tapes will not get pulled to tightly.
All in all, I like the Betterdry diapers better than the iD’s and I’m glad I switched. With that being said, the iD’s are a great diaper and it’s disheartening to know that it’s one more option I won’t have...
EDIT: I just realized I didn’t really answer your question fully. I do not know if the iD’s are being discontinued, or are just not available anymore through XP. I really hope they aren’t being discontinued though; otherwise it’s another plastic backed diaper that’s gone.