Hi there,
I recently got a front bumber of ebay cost about 180 all up including delivery from the uk. It arrived pretty quickly and it seems pretty good quality to me. It's from a company called NCP. The black option matched my 91 xs nicely, they also do the grey mark 1 version. You'll find the odd interior part on ebay too but some things are quite expensive for what they are.
Cheers
neil