I had no fresh flowers at my wedding. We had Real Touch flower bouquets for myself and 3 bridesmaids. No boutonnieres, no corsages for moms. And we put some of the flower petals on the cake instead of a cake topper. I spent about $50 on flowers. And it was perfectly fine. I didn't feel like we were lacking flowers at all.
As far as getting real bouquets, costs can vary greatly by type of flower, time of year (if flower is in season), location (if they need to import flower), where you buy them, etc. You could make bouquets yourself and buy flowers cheaper from Costco, farmers markets, or even a local grocery store. There are online flower wholesalers that sell cheap. Or you can find a wide variety in prices for pre-made bouquets. So, look around for deals. Prices will vary a lot based on what you are looking for.