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If you can find a vendor, you may pale at the cost. I'd guess $100 for a socket in that size, because you will only find it from better vendors and single large sockets--not even deep ones--are incredibly expensive.
An alternative might be to look for a tool rental company or a hydraulic lift rental company in your area, many of them will also rent you a tool for the day. If you can find an AutoZone store, they also rent and loan tools, although this may be outside their range.
If all else fails, you could take a standard 1-1/8" socket to a machine shop. Have them cut it in two, weld the ends into a pipe, and voila, a deep socket. (Yes, big deep sockets really ARE that hard and expensive to find.)