I just got off the phone with BMW Finance and they confirmed that fact. You are correct. The ESC cost less if purchased at the time of original sale. But the difference is just $400($4420 vs $4820) in my case so there would be no rush to by it initially. In my example I have ~45k on my X5 currently.
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2011 E90 335i xDrive 6AT Performance Edition Package, M-Sport, TTFS Tune, VRSF 3.5" Catted DP, Active Autowerke CP, Turner Motorsport Strut Tower Brace, Hawk HP+, Bilstein B6, Alpina B3 TCU Flash, K&N ----
2014 F15 X5 xDrive50i M-Sport, RSE, 3rd Row
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