THey come down by the ton in the spring - I have lots of seedlings that have germinated in my garden, if you live down my way, you can have them. I live in Chatham and could possibly give you at least six to ten seedlings about 8-15 inches high. Come spring, though I ccould give you a huge pail full of the seeds with wings. Normally, I clear cut - yank them out by the handful.
The question is why do you want silver maples - to me they are just big weeds - grow fast, and shed seeds like mad.
Anne

Hello- Although I'd love your seedlings, I'm in BC, and shipping may be a bit risky. I'd be interested to trade something for seedlings if you are open to sending by mail.
I'd like to get a dozen or so growing out on the acreage. Seems they love water and grow exceptionally fast- they'd bring shade to me and the livestock- while the "good" trees are taking root. In time the silvers will be cut down to make room for the other shade trees. I read they break easily in wind/ice storms so they aren't permanent trees- just functional.