I don't think cow-free dairy is a "cheap" ingredient.

When it comes to vegan milk alternatives, it's the closest you can get to actual milk, and it's still fairly pricey.

Edit: ok I'm not sure why you messaged me instead of commenting, but I don't think it's going to be a cheaper ingredient than any alternative soon either. I also don't see why you're using this as a dig against Ben and Jerry's, like they're using the most expensive, highest quality option on the market but they're bad because that will be cheap one day???