You could try Bububebes - they're a slightly different shape, so whereas I'm just about getting to the point of not being able to snap the hip snap on our GMs, DD still has plenty of room in her B4s. I also like that on the highest rise setting you can snap the soakers in the front, so you don't have a row of exposed snaps across the tummy. Snap covers are a good solution as well though, I use them in my Piddle Poddles because they fit a little smaller than the Goodmamas. I'm sure someone could make you a couple of sets and it wouldn't cost much, they're just little squares of OBV like this: http://hyenacart.com/piddlepoddles/index.php?c=0&p=1437
ETA, I'm sure there are also some similar nappies with no exposed snaps, but can't think of the names just now (you could always spend an hour or two browsing HyenaCart
)... I can think of loads of side-snapping ones, but not front-snapping just at the moment. I'm sure you'll get some suggestions though!