MycoGrow is what I use. You do not need to buy a large amount as a very little bit goes a long way. You could contact the company and see if they would be willing to mail it to you in a greeting card. It is far cheaper for us to send cards overseas than to send padded parcels. Purchase the $5.00 package. It will last for about 9 months.
Here is a thread on using the electric toothbrush.
http://www.tomatoville.com/showthrea...ric+toothbrush
Cheers ~ Patti