Update: I spoke to another company and he suggested to save money I should DIY the outside of the tub, and he would do the inside strip and reglaze for around $650.
The outside needs to have the failing paint removed, so first I need to do a lead test. If it has no lead, I can go at it with a grinder then repaint. If it does have lead, I could have it sandblasted for around $100. Problem is, this thing is so difficult to transport, and there are stairs involved -- this is not a good option.