I want to buy depo LEDs tail lights but cheapest I can find is $800. I see people were buying for $600 in June on group buy. Where is cheapest I can get it?

You can get them for $600 shipped on ebay.

I can't find it on eBay for $600.

You may be right. I can't find them at that price anymore. The vendor I bought them from was fishcake321, who has lots of Depo stuff, but isn't currently listing any Porsche tails. You may want to send him a note, otherwise the best I saw was about $800.