if you have a 7 inch tablet, here is a folio case with keyboard and built in stand.
here is a stand-alone stand,
as for other accessories you will have to search the internet, such as,
i have bought several items from McBub USA warehouse, never a problem.
you can also try wal-mart, newegg, tiger direct....
on the spare wall charger you could try radio shack, just match the specs with your current one...or try calling or e-mailing VitalASC, contact info below.
Sales Tel: 1-909-839-1985 Fax: 1-909-839-0254
E-mail: firstname.lastname@example.org , email@example.com, firstname.lastname@example.org
links are not live anymore so you will have to copy & paste.