americanmeadows.com sells flower seeds in bulk. It appears they have every flower seed you think of.
Thursday night is garden TV show night, 6 shows in a row, 7 pm to 9 pm. A farmer bought 1 lb of Zinnia seeds and planted a whole acre of flower. WOW they look nice. I use to plant Zinnias but not planted any in 5 years.
You can buy bulk seeds from https://www.americanmeadows.com/
I bought 1/4 lb of mix color Zinnia seeds for $12. I have a place about 14'x30' I will plant. 3 flower beds in the garden 32"x35'. Both flower beds east side of house & north side of house.
This is the Zinnia seed mix that I bought, red, orange, yellow, pink, purple.