University of Pennsylvania is offering a fully online undergraduate degree program.

[Alpha]

This existed since years ago.
However, their tuition fee is NOT cheap! Thy charge $1200 per credit. So even if you manage to transfer 90 credits, you'll be charged at least $36,000+ for a liberal arts degree.
If you fail to transfer the 90 credits, the price will be abnormally high.
It costs $144,000 for the full 120 credits. I don't think many people will be able to pay that much price for an online degree.

If someone gave you $144K on the condition that you use it solely for your higher education I think that most people would spend it elsewhere.  I think that you could get a pretty good degree for a quarter of that amount.