Surely this is illegal?

A domain name of mine expired last month, so I still have the window of opportunity to renew it, and I believe still have entitlement/option to it for 9 or 12 months from expiry date anyway?
Today I had an email from a domain seller offering it for sale to me for $199...! and I'm assuming I won't be the only one they'll have emailed.
is this legal?
Thanks
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