Ok, so you need to get your parents there, here are the options
1. you get them tourist visa and the validity is to live for 6months on a stretch and then leave border and can come back after a day for next 6months. To get this visa you need to apply for them couple of months before their travel. I suggest apply for this visa once you get MR request. this way by the time you are ready to fly, their visa will be in hand and can travel per your plan
2. apply for super visa, this is another way to getting parents. But for that you need to show some income for 1 year and then only file it. on super visa your parents can stay for 2 years on a stretch.
3. when ever PR for parents open up by CIC, apply it.
Hope this helps both of you guys. BTW, m also in same BOAT