I admit I don`t actually like E Bay that much, but......
I bought a set of these wipers (E Bay item number 2912 8119 5842) for £4.95 which I`ve just fitted to my Focus. To be frank I`ve no idea how they can make any money selling those for £4.95 (including postage ! ) but they do fit. I haven`t tried them in the wet yet, but I hopefully they`ll be OK.
A few useful points on these wipers "AP Automotive" Hybrid blades. They (correctly) sent one 22" and one 17" for my 2006 Focus. When they arrive they have the H1 adapter fitted, the one to fit the standard hook type wiper arm. This must be pulled off, and you have to pull pretty hard, in an upward direction straight off the wiper, don`t worry, underneath all that plastic is a steel frame and pin so you won`t break it. Then fit the H7 adapter, and this requires a hefty push to get it to fully locate onto the mounting pin and end up flat and parallel with the wiper. Once you`ve done that they went straight on
Note : as of March 2015 they`re now £9.95, still cheap, but not unbelievably so.