Until they recently (and abruptly) closed, I had a house account at MyFitFoods. You put $500 on their house account and got a $25 bonus, and was able to make fo

Until they recently (and abruptly) closed, I had a house account at MyFitFoods. You put $500 on their house account and got a $25 bonus, and was able to make food purchases from it. When it ran low you could top it up. A similar comparison would be prepaid cellular phone service. You put money on the account and draw on it by making calls.