No such thing anymore...
What you are referring to is OTB (over the bench) - > Highly dangerous, possibly illegal (for the counterparty) etc.
Dependent on your location though there's normally many parties that do this, where i am it's the Russian's (asia).
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Legit method is OTC, which is usually carried out on the exchange (different access point).
Full KYC/AML and Reporting (which is good as you get invoices/docs) for Source Of Wealth, Source of Funds, Conversion Quote, Completion Doc, etc.