Costco Flowers

I was in a wedding where the ready made bouquets had to be picked up from the florist the day of the wedding, and even that ended up being super hectic. I personally would suggest against adding a trip to Costco on the day. Buying them before I think would be too much of a risk.
Artificial flowers like everyone else mentioned are great alternatives, which I will likely be doing myself.

We went with artificial flowers, Michaels has a seasonal sale at the beginning and end of every season. I picked up our flowers at the end of fall for 3 bridesmaids bouquets, my bouquet, 4 boutonnieres, 18 centrepieces, and decor for the arbour for about $150

I’m not sure if you’re open to artificial…. But if you’re looking to save money, I got some unbelievably beautiful flowers off of AMAZON and spent $150 total for mine and 4 bridesmaid bouquets

I see you're not too far from Edmonton. My husband and I used silk flowers for our wedding if you're willing to consider artificial. We used FLOWER AFFAIRS on the south side of Edmonton and our flowers were absolutely stunning

Have you looked into silk flowers instead? Found an amazing girl here in Ottawa and charged me less than a florist.

Only do it if you are planning to make a trip to Costco on your wedding day to pick up said flowers. You risk them wilting if you pick up flowers the night before. And sticking them in your own fridge won't work either because they're not calibrated with the same humidity for flowers to stay fresh.