The good ones are pricey, but worth it - there's a lot more that can get broken on a keyboard than on a guitar (unless you play Gibsons ). I got a mid-tier Gator for my Nord that i was comfortable using taking between home and our practice space and to the occasional gig. I wouldn't have felt good about using it in a touring van or another situation where I was not the one loading/unloading it.
One tip - measure your keyboard and make sure it's a good fit. Cases can be wildly off because of the variability between one company's "61 keys" and another's. My Nord is a 61 key, but it doesn't have mod or pitch wheels, so the 49 key Gator was just right.