You are looking in the wrong place. Lapping in the US is actually cheaper than Canada.
Really? I have been browsing Circuit ICAR (Montréal) and it's not terribly expensive. I know a one-day session with various automotive clubs at VIR or Atlanta costs the better part of 400-450$.
Drive Atlanta Motorsports Park with Just Track It on Saturday August 29, 2015 Cost $250 per driver
Friday, May 22 — Saturday, May 23, 2015 Atlanta Motorsports Park, Each day at $199 and if MCA member,the cost is $179
VIR Club Thursday, Jun 18 — Friday, Jun 19, 2015 Virginia International Raceway, $175 for Club Member, $175 for Guest in Touring Lites,
$350 for Guest in Passing Group