If you're truly only hitting the slopes once or twice a season, single-layer foam goggles can get the job done on a budget. They'll provide basic protection from wind and snow, which is better than nothing. Just know what you're signing up for: the foam compresses quickly, doesn't manage sweat, and may not create a great seal against your face.
The real downside is comfort on longer days. Without multiple foam densities to cushion and distribute pressure, you're more likely to feel discomfort or even pressure points after a few hours. The seal also tends to be weaker, meaning cold air and moisture can sneak in around the edges.
If you can stretch your budget even slightly, dual-layer foam is a meaningful step up in comfort and durability. But for occasional use, single-layer goggles are a reasonable choice—just don't expect them to last multiple seasons or feel great on an all-day mountain session.