So, the part numbers are U2008B-MFP, U2008B-MFPY, U2008B-MFPG3, U2008B-MFPG3Y, I belive? It looks like Atmel manufactured these in Heilbronn till 2008, with Telefunken Semiconductors GmbH & Co. KG continuing the manufacturing 2009-2012; so there might be both "ATMEL" and "TFK" branded genuine SOIC-8 ICs out there.
Aside from eBay/AliExpress, rxelectronics.com, good-chips.com, veswin.com, depu.net all claim to have new old Atmel/Microchip ones in stock, but you'd need to request a quote.