Where can i buy headlights for a 73 Supper Beetle?

Any decent parts store should have those headlights in stock, Napa, Autozone, Advance Auto parts all carry the older large round headlights because many older cars used them, not just the beetle.

Call your local parts store

Assuming you mean JUST the lamps and not the entire assembly:

Kill two birds with one stone.

At JCWhitney.com you can not only get new headlights, but you can buy a conversion kit that changes them over to the brighter and more reliable quartz lights used in newer cars. Runs you about $35 plus the cost of the lamps which you can then pick up at a local auto parts store.

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Advance Auto parts all carry the older large round headlights because many older cars used them, not just the beetle.

cip1.com sells pretty much every part you can think of for air cooled VWs

Good luck

at auto parts store.at junk yard.