All manufacturers now seem to run an attachment-‘leg’-bars system, so you can change cars more simply or choose the exact system you want.
Get on Gumtree and see what is there – they come up all the time, and you find some random cars share the same fittings. Find out what other cars your attachment and ‘leg’ item is shared with.
What car?
(And Thule are well worth the money over time. Having said that, I just bodged my own super wide bars to avoid paying for their ‘Pro’ bars to carry the two canoes, but used the existing feet and attachments I had)