Sardis or Sardes known in Turkish as Sart is a village of Salihli. It was the former capital of Lydia, and is now a small town which seems exist mostly as housing for local farmers and shepherds.
There are two main attractions in Sardis, and it costs five lira for a ticket to see both. The Temple of Artemis is a ruined Greco-Roman temple, which also has the original crane from the early 20th century excavations. The gymnasium complex includes the ruins of a Roman era synagogue.
Additionally, there are several other sites, shown on maps at the gymnasium and temple, all of which are free to enter, and several of which are hard to find.
Public toilets are available if one walks west from where the bus drops you off, and unlike most public toilets in Turkey, they're free.
Neither of the main attractions has a museum shop.
While there are several restaurants, convenience stores, and tea houses (which serve only simit), all of these are somewhat run-down. The best variety can be found by going into the center of Salihli, where there are several restaurants and a large agricultural market.
Tea can be had at a reasonable price at a handful of tea shops along the main highway to Salihli.