I want some 101s but the prices vary so much, they are between £79 - £69 does anyone know if I could get them cheaper anywhere

No you can't.
Merlin have some at £69 plus £2 p&p

If you've got really small feet ie. size 36/37, sjs cycles do the D100's which are pretty similar for £29

About £69 is the norm,but don't expect them to be totally watertight.The main shoe's fine, but where the neoprene joins the boot at the front water pours in from the spray off your tyres when there's a lot of water on the ground.

You'll get wet feet but they will stay warm