You can buys a 119/118.7 LNB for about $20-$25. Do a google and you will find several adverised. You need a 30" dish and that might be a deterrant to some.
What do you mean they will be combined. Do you mean all the channels will be moved from 121 to 118 or do you mean they will be available on both dishes. Thanks.
For some reason I think 121 international will be no longer available on 121. Perhaps combined to 77 or 118. Will not affect 61.5 or 148. Or maybe changing the type of switch