I would like to know if there is a store I can walk into to purchase the AC|DC Adapter Power Supply Wall Charger for a Sylvania 7" Portable DVD Player for the sdvd7015?

SOURCE: Wall charger

Radio shack carries a universal kit with choices of many different voltage and milliamp combination. Bring your DVD player to them, and they can help find the one that best suits you.

SOURCE: Wall adapter for the Coby TF-DVD7100 portable DVD player

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buy replacement ac power adapter for Coby TF-DVD7100 TFDVD7100

SOURCE: AC DC power for Magnavox MPD845

You can buy a new one by clicking on the hyperlink:
buy replacement ac power adapter charger MAGNAVOX MPD845

SOURCE: replaceing the charger for a CyberHome Portable DVD Player

Please click on the hyperlink below:

buy replacement ac power adapter charger CYBERHOME CH-LDV 707B CHLDV707B

SOURCE: Durabrand Portable DVD player (Dura-7) AC Adapter

after losing the adapter to my portable dvd player i went to the localwalmart and in the electronics section they had all kinds of ac adapters. a generic one with the same volt rating as your old one should do the trick.