They seem to have high quality engines and actually tell you what hardware and engine your getting, any other engines on ebay are just generic 66cc 80cc engines. not saying these arnt generic but you know what your paying for. Im going to try my luck with them.
https://www.ebay.com/itm/80CC-PK80-...hash=item28924b2a1f:m:mlFeMBNPhu9_4WDS7Td-86g
https://www.ebay.com/itm/80CC-PK80-...hash=item28924b2a1f:m:mlFeMBNPhu9_4WDS7Td-86g