Any recommendations for weights plates brands?

Which country are you in? What are you using them for? (Ie do you need metal powerlifting plates, rubber weightlifting ones, fractionals or the big ‘uns?)

If you are buying Olympic weight plates, they are sold usually by the lb or kilo. So I wouldn't expect to find a "cheap" brand per sae.

The only obvious expensive plates sold in the stores/online is if you are buying calibrated plates.

Bumper plates can be somewhat too, but unless you are planning on doing actual Oly lifts, I wouldn't suggest bumper plates regardless for many reasons.

Even used Olympic plates are not much difference in price from the new. You might find some yard sale or second hand store bargains, but because of the pandemic those are extremely rare.

If you do find use ones, they are really easy to refurbish to clean working sets with a tad of elbow grease.

Goodluck.