Hi Rick
I have had good luck with people picking up everything from $1 gray ringed chips - and variations of the black ringed chips.
Same for 2.50's and $5 chips.
I wasn't aware they were using anything besides coin inlays in the lower denominations.
(????????? SOMEONE BETTER TELL ME IF THEY GOT NEW CHIPS )

Now - unless this has changed VERY recently -
DEPENDING ON WHO'S DEFINITION of OBSOLETE you are using
(and I ain't going there tonight!! )...
You should be able to get all/ most of the variations if you can find them.
At least I have been able - and I haven't even been there.
And I have been told that all of them (gray/black/ variations of $2.50's and blue v. greenish ringed $5's) are still in play.

Bernie Sloan is AC_saavy ... and is knowledgeable in the Harrah's Marina's. You could ask him and/ or of course, Archie. Either one should be able to confirm current availability of specific chips at the casinos.