In Tennessee theft offenses are determined by the value of the property alleged to have been stolen. If the value of the property is over $500, then it would be charged as a felony in Tennessee. The greater the value, the more severe the possible penalty.
$500 - $999 is a class E felony. It's punishable by up to 6 years of prison and a fine of up to $3K
$1,000 - $9,999 is a Class D felony. It's punishable by up to 12 years of prison and a fine of up to $5,000.
$10,000 - $59,000 is a Class C felony. It's punishable by up to 15 years of prison and a fine of up to $10,000.
$60,000 + Class B felony. It's punishable by up to 30 years in prison and a fine of up to $25,000
Selling stolen goods is an intent crime. By that I mean that the state must prove beyond a reasonable doubt that the defendant knew that the goods were stolen when he tried to sell them in order to be convicted of the crime. There's a vast difference in the quality of evidence needed for an arrest versus what is needed for a conviction. So a felony charge might be automatic, but a conviction, less so. Also, charges are frequently reduced for plea bargaining purposes. And prison, though possible, can generally be avoided on the less serious felony offenses of this kind. Probation can typically be negotiated.