You didn't specify just Vegas, so here is what I have in my collection...from my database:

$3.00 chips---------

Rainbow

Harrah's (laughlin) 2007
Harrah's (Laughlin) 2004 E3802
MGM Grand 2006
Oasis (mesquite) 2008
Palace Station 2001 V6504
Palace Station 2001 (25th anniv)
Palace Station (Corvette)
Palms 2004 (9 & 18 Hold em)
palms 2003 (9 & 18 Hold em)
Plaza, J Gaughhan's (Poker and Pan)
Plaza, J Gaughhan's (baccarat)
Reserve (rainbow Giraffe)
Sharkey's 1980s) N5705
Speedway 2002 V9818
Venetian (poker room)
Wynn 2005 (poker)

$4.00 chips---

Aladdin 2005 Planet Hollywood Coming
Artichoke Joe's 1993 N7371
Bally's/Paris 2006 (numbered)
Bally's Paris 2006 (no number)
Binion's 2005
Eureka 2008 (poker room)
Hard rock 2008
Harrah's (vegas) 2004
Harrah's (Laughlin) 2007
Horseshoe (moneymaker)
Horseshoe (farah)
Imperial Palace 2006
Luxor 2006
Palms 202 (bingo Ellie)
Planet Hollywood 2007
Stratosphere 2008
Tropicana 2008
Venetian 1999