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Are there any cheaper options
No, I think you've probably plumbed the depths there 🙂
Nothing wrong with any of those components, they will build a decent pair of wheels if you do your job. To save any money in the centre you're dropping into either Shimano or chinesium OEM hubs which would be a false economy. If you want to waste a whole day shopping around to save £7, http://www.mach1.fr/en/rims/univer-u0/style-s0 & https://rodicycling.com/en/rims/ have models you could try to seek out which are the equal of Ryde.
What's the cheapest set of components that you would consider would build up into a decent wheel I.e. would be worth putting the effort into building. I'm after a set of 700c, rim brake, 9-speed wheels (traditional spoke count, wide-ish road/touring rims) and I'm considering building my own.
A pair of Shimano Sora hubs, Rigida Ryde Zac 2000 rims, and ACI Alpina spokes currently comes in at £106, which seems steep given that I'd be putting in all the labour. Are there any cheaper options that wouldn't represent a big drop in quality?