eBay, just search up hps teardrop
Actually, when I typed in "hps teardrop" on eBay, it yielded no results of the actual lanterns. The term "teardrop" is not used by the general public in reference to the lanterns with that style, and the term "teardrop" is only used by collectors alone.
Here is a link to the results I got when searching "hps teardrop" on eBay:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=hps+teardrop&_sacat=0Note that they are not what you are looking for.
It is also the same whenever I type in "fluorescent halfpiper" on eBay too since the term "halfpiper" is primarily used by lighting collectors alone to refer to a type of vintage fluorescent light fixture.
Here are my results on eBay when typing in "fluorescent halfpiper" in the search bar:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=fluorescent+halfpiper&_sacat=0You might get better results if you search "vintage street light" on eBay.
Here is an incandescent teardrop that I found on eBay that you can convert to high pressure sodium by wiring a ballast to the lantern, but the pricing is extremely expensive:
https://www.ebay.com/itm/185079184743?hash=item2b17943d67:g:Z1EAAOSwn35hVQDu