May have trouble getting it cheaper. There are guys that can do the job in 10-12 hours, but getting them to do side work is tough.
Stick with original parts.

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Mercedes-Benz Master Guild - 2 years
Shop Foreman - 20 + years - dealer.
Part owner - MBZ Transmission remanufacture
2000 SL500
1995 E320
1989 300SE