I plant a lot of turf-type tall fescue. My go-to grass for areas in full sun that burn out. Nice deep dark green that once established is drought resistant. The Lesco Teammates plus (has some perennial ryegrass and bluegrass in it) available from SiteOne is what I use. Likely a store near you. They mostly sell to golf courses, municipalities and landscapers but will do retail sales too.
SiteOne has different pricing tiers for their customers and you'll likely get the highest. But no harm asking if they can mark down for you, which managers are given the discretion to do. They also have the straight Teammates tall fescue and might have other tall fescue mixes or varieties as well. Bags are all 50 pounds as far as I know.
Edit- we have some Zoysia in my area. Good luck crowding it out. Probably not worth the effort.