I took on the task of ordering the flowers for the family when my grandparents each passed away. The florist in my fairly small town was really reasonable, this is now 5 and 8 years ago, so I don't remember the exact pricing, I think for my grandma (8 years ago) there was a 2-dozen red rose cascade from my grandpa, a fall-arrangement in a basket from my parents, a different fall-arrangement from the grandkids, and a small arrangement from the great-grandkids inside the cascade. I think that was about $250.
When my grandpa passed away, I think the flowers were about $200. The same florist did a lovely arrangement with yellow roses and dark purple irises, from my parents, the grandkids had a spring-seasonal basket and the great grandkids had a small arrangement for inside the casket.
The florist was wonderful to work with. I was very specific that i didn't want the flowers to be "funeral looking" and they weren't. I was also very specific about working within a certain budget, and she stuck to it. With the budget, I said I have my total amount, and that needed to include delivery, taxe and set-up fees.
When my SIL's brother passed away, all of the sibs on my DH's family contributed to an interesting arrangement, which - total including taxes & delivery couldn't exceed $80. The person who died was an avid outdoorsman, big hunter etc, and the funeral was in late November. The florist did a nice display of pine boughs, a plaid ribbon, and it included a ceramic figurine of a bear. My SIL was very touched with the display, and the widow still has the figurine as a remembrance.
My advice - find a florist you trust, go in with a budget, and use flowers that are seasonal. My guess, that this week, some of the problem is it is Easter week, and during the "floral holidays" i.e. Valentine's day, mother's day, Easter etc, prices just tend to go up.
Unfortunately, "MY" florist retired.