in canada costco sells Wilson US open for around $10 for 4 cans.
Are those good?
Yes, they're very good. Plus, they're easier on the arm than Dunlop Grand Prix. But, then, that's why I prefer the GPs, because I can feel them more on the stringbed.
Dunlop Grand Prix.
Wilson US Open balls! These things last forever, and they provide the truest bounce and response to spin.