I lucked out.
I bought a set of Dunlop Sport M3's off of craigslist, $100. The guy even dropped them off to my work. I swear they are as new.
I also scored OZ Superleggeras which would normally cost $1500+ with only 2000 miles on them and are mint, $375 from a BMW tech friend.
So scour the forums and CL, there are deals to be had.
'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'15 Buick Regal "T"(wife)
'06 Saab 9-5 Combi 5mt (full suspension, LSD, clipped turbo etc)