Here's your dipstick - http://cgi.ebay.com/ebaymotors/Mercedes-722-6-Transmission-Fluid-Dipstick-Repair-Tool_W0QQcmdZViewItemQQcategoryZ35625QQitemZ4631006626. Just bought one from them - good service and the best price I could find.

Try these guys for your ATF - www.importec.com, although I see many of the World Pac guys say it is temporarily unavailable. Give them a call. I think it was $12 or so when I bought some a month ago.

Also, look here http://www.***************/search/productx.aspx?sid=2n5vss45p1t3ybzmynwo2045&makeid=800016@Mercedes&modelid=1376175@E300D&year=1999&cid=98@Fluids%20%26%20Chemicals&gid=2222@Miscellaneous%20Fluids/Treatments

Len