Christ, I'm gonna get mullered for this but I've spent several hundred. I usually proxy Japanese denim and that pushes up the price with commission and postage. It's brands like Hinoya, Samurai, Sugar Cane, PBJs, 45rpm, Skulls. Some brands have recently become available in the UK but I'd say on average between £200 and £300 for raw denim. A lot of hand dyed with natural indigo (twice fermented while buried underground in clay pots for 20 years) using aizome (traditional Japanese indigo dying artisan techniques). Even Lee repros are produced by Japanese companies, Edwin and Real McCoys and licensed by Lee to use their logo. I never, ever buy washed or distressed denim because it looks shit. It takes patience and love to produce great looking natural jeans and in my not so humble opinion it's worth it. Even those among you who subscribe to the 501 STF look would do better to purchase LVC versions - they're stitch for stitch repros of jeans produced in earlier decades.
I'm not really a label whore, I'm just obsessed with denim. I could talk for hours about this and on some specialist websites I do. I have over 30 pairs on my current rotation!
Shoot me. dons flak jacket and tin hat