If the chip and or stamp are “gently used” or the stamp is fading and chip has some wear, then you can expect $1> per.
Well worn bursts will go for $60-$80/rack. Even well used bursts are great chips and beyond serviceable.
When you see THC Starbursts or mono-gram chips on eBay or anywhere but PCF, they are usually overpriced.
Except the Facebook marketplace score from an unwitting civilian. This is my favorite move for well priced chips.
Edit:
Oh and starbursts in pretty good shape can be found reasonably around $150-$200rack, sometimes. BUT that’s for the basic colors. Red, Blue, Green, and sometimes white and black.
If you see racks of the more rare or cooler colors, then you can expect to pay over that $200.
Oh and in my experience it was way easier to get starbursts piece by piece.