I just got a squid a few days ago. The problem is that the tube keeps popping. If you inflate the tire over 30psi, the tube comes out from the tire and pops. I’ve already busted 3 tubes and tried 2 different tires. It almost looks like the rim is a little too small for a 20" tire (but it’s definitely too big for a 19" tire). Note, the tire comes out whether riding or not. It popped again last night, after I put the uni away for the evening.
BTW, I prefer the ride when the tire is hard, it feels weird at 25psi.
That has happened once on my Torker LX, too. It was not too long after I had ridden through some water, and I suspect that helped. I think the tire may have been a tad low, not overinflated. When I posted about that experience, someone mentioned that once that happened, you couldn’t reuse the tire because it wouldn’t seat right. I don’t know if that’s true or not, but could be part of the problem.
You might check that there’s not any oil or other lubricant on the rim, and try to make sure the tire is centered on the rim as you’re airing it up.
If you have a bicycle shop put a new rim on it, it’s liable to cost you what you could buy a new unicycle for off ebay.
The only place I have seen the Mongoose Squid was back before Christmas on the Target web site (wasn’t in stores, even).
However, regardless of how good or not-good it may be, I would expect that the rim is the same one used on a lot of 20" bicycles, and they don’t just sit around blowing tires off, to my knowledge. So I would think the right combination of tire, rim, and installation procedure should take care of it.