Rear Wheel 700 , 7 sprocket cassette , OLN 135

Plenty of eights, will check for 7's. I've made 7's from 8's in the past, just leave 2nd from bottom off. Ideally go with 12-23 or similar, lose the 13, add a thirteen closing sprocket.
 
well sadly I don't have a lot of workspace so "like for like" is always favourite for me ! How much for the wheel/ cassette combo assuming you can source a seven ?
 
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