Giw

My local garge told me I need new rear calipers on my 2.0 Hdi, coz they're sticking (probably explain why I went through a set of pads in 15k miles ;) ) Any ideas where I can get some sensibly priced refurbs as some websites are quoting silly prices. Also, tried to change the pads and disks tonight and failed. :( Hour and a half to get the pin out that hold the pads in (due to me bending it the last time I changed the pads), further half an hour to get the bloody pads out (due to calipers sticking I presume as last time they were much easier to change) and then... the head of the screw that holds the disk on turned to a pointless mush of metal that no socket will grip with one turn! Now what? No disks = no pads = no car. Any ideas how to get the screw out or am I destined to call a mobile mechanic to get the disks off for me? Cheers!!