Vinyl plank floors are the best value and most durable for rentals. After much experience over the years these are proving to be the best. Ive installed them in 20 units of a C class multifamily I am repositioning.
floors2yourhome.com (no affiliation) often has very good deals especially on smaller quantities. I recently got 1000sq ft 12ml wear layer vinyl plank for 1.21/ft including shipping (freight curb delivery)
@Mike Dorneman what brands do you like?
@Joseph Puthusseril you can't go wrong with places like Home Depot. Always check your local hardware store for great deals as well.
Lumber liquidators run great deals all the time. I used them for waterproof vinyl plank flooring twice last year for a few buildings on my retreat center property.
I second @Sarah Lieberman . Recently got 1000sqft of LVP from them during a promotion. I believe it was 1.60 sqft. Best decision of my life because shortly after my tenants moved in there was a roof/ceiling leak. The floor was not damaged at all. I plan to use them again in the coming months for my next reno.
Best part about Lumber is that you can get a store card and wrap the installation into the payments.