We use The Guarantee Company Of North America, 954 Dundas St. Woodstock, ON 519 539 9868. The bond is obtained through our insurance broker, so I am not sure if you can go direct to this underwriter or not. The premium for us last year runs around $3000.00 for the 75k bond. I wouldn't be surprised if the rates have or will be going up this year. If you find someone who offers the bond at a significantly lower rate, please let us all know. As a broker, you know we're always looking for the "lowest rate"!
We use CG & B for our error and omissions/ contingent cargo policy as well they get us our surety for $ 3000 USD. never had any issues with them ( been with them for 10 yrs now - based out of markham, ON )