The cost is a cost of the seal...here (when I transfer in US$) that seal is ~ $23
Of course once you are changing seals you should change transmission fluid (oil) as well....
You should do it the sooner the better cause of the transmission fluid (oil) pump, cause there is no pressure that it needs to have in that time since you place it in D and until it actually starts going...
To replace that seal you need to take the engine out, and then to take out the gearbox and torque converter...when you remove torque converter you will see that seal (it is about ~4cm in diameter in the center of gearbox where torque converter is getting in)...
Try looking on this forum for some pictures if someone already did it...
And you can check here for more about automatic gearbox (useful to read) :
http://www.familycar.com/transmission.htm
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1994 Toyota Camry 220 SEI Automatic
RHD (yes, stupid right hand drive since I moved to SA
)...
