Wight your door with no spring tension on it and find springs that are suitable for that weight.

I always get them on ebay. It'll take 2-4 days to get them usually.

Do you have a heavy door or is it just lightweight steel or aluminum? If it's just a lightweight door, you may just need to open it by hand for now until they are shipped to you.

My doors weight 380 lbs and I can't even open it when only 1 spring is broken. We don't have a door that leads into the garage so this door gets opened and closed probably 25 times a day. the first time it broke was at the end so I removed the 1.5" of broken spring while I waited for a replacement. I never changed it out and about 6 months later, it broke gain and that's when I finally changed both out.