Arbela47000,
On sale or not, do not make a rush decision until you understand what you need and want.
If I buy something and they tell me its a one time offer I stop talking immediately.
Others have same unit for little more so sale term is relative.
Spending this kind of money should be a big decision, time invested can have big payback in getting just the right thing for your situation. Waiting for the next sale may be worthing while learning about it.
Many options out there, unless we understand what your goals are we can't help you very well. Have solar, grid tied, wind, hydro, need load dump, tracker etc?
All too often people decide they want something. Then they post asking if what they did was good??
Does not compute. Ask first has much better outcome for you.
Have fun,
Scott.