In the UK, we have a chap named Mark Grant, who makes and sells some nice and not always expensive cables of various types. His mains cable is high current rated, screened so it looks posh and it's very well put together with good quality sensible parts. It cost me around fifty quid here for a 1m iec to 13A plugtop cable -
https://www.markgrantcables.co.uk/department/mains-power/mains-power-cables-mains-power/
Buying everything in one-offs as a domestic bod, I honestly doubt I'd be able to get the parts for much less than half the price. His interconnects with sensible connectors at fifty quid or so are also very good if you can afford the extra over the perfectly good Van Damme types (brand snobbishness often makes Van Damme look tacky but again, use them 'blind' forgetting they're there and they're absolutely fine!!! - maybe a different colour than black might help
) Look at his prices for the WBT ones though - same wire but foo plugs which can rip basic RCA socket banks apart if you're not careful (most audiophiles aren't very careful in my experience! - took one to know one...
)
https://www.markgrantcables.co.uk/department/audio-cables/stereo-cables/
Seriously, you really don't need to spend shedloads of dosh on wires and connectors. I do accept that people who've spent tens of thousands on their stereo may want expensive wanky wires to connect the parts up with, but it seriously isn't necessary imo.
A pal who worked for years in a high end London 'audio salon' once raved to me about the new 'cheap' Transparent Audio mains cable. Cost a mere £760 at the time I remember. Transparent also make mains filters in expensive nicely shaped boxes - thousands each I believe in different caste-tiers without checking - and apparently, you can only use two sockets out of four for best 'sound.' That store had awful mains though and when I worked there for a few months back in 1998, we used the Russ Andrews mains blocks at then £200 (Kimber wired?) to great effect.
So, my pauper mentality suggests not to bother with expensive foo wires and boxes, but if you have a very expensive flash stereo, that's not going to put you off