I was going to suggest the one i've got, which is the best i've ever had.......
Mountain Equipment/Ron Hill ShakeDry........ it packs up really small, is brilliant, as as the name suggests you can shake the water droplets off and it'll be dry again in half hour.
However its at least in the region of £200, if not more.
Montane Minimus seems to be a popular one, and i'd probably gamble on it if i found a good deal...... although i've not had one myself so can't say for definite.
ultra lightweight, breathable waterproof jacket that packs down to the size of a tennis ball.....
www.peteblandsports.co.uk
6TH GENERATION KAMLEIKA JACKET 4-WAY STRETCH WATERPROOF SOFTSHELL, NOW PFC & PFAS FREE. COMFORT & PROTECTION FOR CHALLENGING CONDITIONS
theomm.com
OMM kit is brilliant and you can't really go wrong there...... you'd probably find the Kamleika jacket cheaper if you look around.