Parts wise, on my setup, i got the projectors, shrouds, headlights, bulbs, and ballasts for $350 from another member who attempted the retro and did not finish
then i paid labor for chicoloco in Puerto Rico to build them
Both cars have 07 Acura TL bixenon projectors, ZKW-R lenses, 85122+ bulbs (whichever ballasts i have) Mercedes E55 shrouds, custom fiberglass buckets
For the wife's setup, cost was as follows
TL projectors -$220
ZKW-R lenses - $45
Bulbs$-40
Ballasts$-already had em
Mercedes E55 shrouds- $40
Headights - $140
Misc wiring adapters- $30
Total-$510 plus labor