I needed some new grips for my CB750K8 so had a look at David Silver as I prefer genuine.
A pair work out at £28.44
53166-390-780 left and 53165-390-780 they also have non genuine
There is also a seller on Ebay with pair Rubber Hand Grips Genuine Honda CB250N CB400N CX500 CB750 CB900 GL1000 classic_bike_spares at £24.95 for pair
Wemoto have genuine too under Honda part numbers, pair delivered comes to £18.46 inc vat and delivery.
There are plenty of non genuine on Ebay for £6-8
Decided to get the Wemoto ones, came through in 2 days and in genuine packets