Been using Nash Butt locks for the last few years on my carp and barbel set ups no complaints from me think there around £13 a pop but I’m a sucker for cork handles and found the tight rubber type ones left marks on the cork when putting the rod in and out.
If you think the prices you've seen are bad, cop this (Read description in below link) LOL
https://www.ebay.co.uk/itm/194940969320?hash=item2d63632168%3Ag%3AdNcAAOSwm21iJMLo&LH_Auction=1