If you are on the west side of GTA, check out EESA, or Galt or Guelph. They will vary from 1-2 hours of driving, but the amount of savings that will result from buying a membership outside of GTA will be substantial. Clubs like Oshawa (sp?) require a share ($1000+) and then a yearly fee ($300 IIRC). For comparison, EESA is $160 per year + $100 one time initiation fee + CSSA membership. However, it gives you 300m, 100m, 75m outdoor ranges and a 25m indoor range. Trap field and archery butts are also available. 24/7 access. Be sure to check out your options before buying a membership. Most places will allow you to check it out. For EESA, talk to myself or Stormbringer here on Gunnutz.
Claybuster has access to guelph, I think. Galt, I am not sure.