Yes, they have plenty .. i was there yesterday.
I'm visited a couple different Costco's recently. They both had different selections of plants and trees. One of them had Roses for sale. It's best to check your local Costco. Also check out garden centers and nurseries for seed packages of primroses. I've seen packages with 200 seeds for under $5. Don't forget to check Amazon.
Not sure but they often have a huge selections of plants and trees this time of year.
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