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I did the rollercentre option a while back, been meaning to get a good pic for ages. I bought hooks from those guys, although I bought the Lite hooks at £10 each . Still not cheap but definitely the cheapest option I could find (both for DIY carriages&hooks and ready-combined options).
I bought the strut from a local electrical wholesaler (TLC) who did delivery. 3m of 41x41 plus brackets and stops etc came in about £40 including delivery. I bought ten hooks (a few bikes +a few sets of wheels + a few spares...) so total cost about £140, and fits nicely across the back wall of the garage. Very pleased with it and just need to decide where to fit the chain mounts.
You might also find these of interest, if you can source a channel strut yourself, the've taken out the work of modding a hook/roller but maybe they cost a little more..
https://www.ebay.co.uk/itm/126246928758