For Mebendazole (Vermox), forum members have found these sites to be reliable: 100drugs.org, evroshipping.com, magicpharma.com, pharmacy.around-world.biz, pharmacyescrow.com, & vrdrug.com.
For Canadians, vrdrug.com ships to Canada in plain packaging w/no Customs problems:
They have Vermox in the 500mg tab size. If you order these, split ea tab into 4 doses, 125mg ea.