I looked online for this tool, didn't see any. Probably out of production. The only way you'll be able to find one is if you just happen upon one locally at a yard sale, your local craigslist or whatever.
One person made one similar by bending pitchfork tines. Don't know if you can do that or not, maybe heat up the tines? Was thinking too, a person might take an old garden rake and maybe remove every other tine making bigger spaces?