Not many for that price any more.
The ones that still are tend to be Roms (so risky) or older women who can charge less because they can use their free bus pass to get about and save money.
There's the obvious one of Kerry in (I think) Ripley. She's £40 for the hour but has a weird booking system. You have to go there and then keep calling her. When one client leaves, the first one to get through to her on the phone goes in next! If you miss out, you either wait for an hour and try again to see if you get the first call in... or you leave. If you're unlucky, you could in theory spend the whole day sitting in the car trying to call her. What a seriously fucked up system!
There's Paula in Mansfield /Warsop. She's a big old granny with tits like a dead heat in a zeplin race.
There is also another granny just north of Derby city centre. I think she's about £50 for the hour. Willing enough but a hell of a lot older than her profile says. I booked her last minute years ago and wouldn't go back. The house had that fusty kind of 'old people's home' smell. She was old even then. If you book her now, hurry up.... it'll be a race between you and the grim reaper to see who gets there first.
For the sake of £10-20, save for a bit longer - up your budget and see someone better. There's almost always a very good reason why some women don't/can't charge as much as the others.
I've found that if I go for a budget shag, I almost always come away disappointed. In which case, it may have been cheaper but it was still a waste of money.
