BigDecimal Valdiation with a String - java

I am trying to validate a list to make the Value is not "NA" and not NULL. I am having trouble validting it since the list is a BigDecimal.

CODE:

List<BigDecimal> queryData = new ArrayList<BigDecimal>(); 
BigDecimal priceValue = null;
        
for (MBSTBABars tbaBar : tbaResults) {
    priceValue = tbaBar.getTbaPrice();
    if(priceValue.compareTo(BigDecimal.valueOf("NA")) ==0) { //Just want to make sure an entry is not "NA"
        throw new Exception("Invalid Data Found In Query..Found: NULL");
    }
    if (priceValue != null &&(priceValue.compareTo(BigDecimal.valueOf(80)) >0 && priceValue.compareTo(BigDecimal.valueOf(130)) <0 )){
        queryData.add(priceValue.stripTrailingZeros());
        }else {
            System.out.println("Value: " + priceValue +", is invalid valdiation failed.");
            throw new Exception("Invalid Data Found In Query..Found: " + priceValue);
        }
    }

Any help find a solution to validate the list for "NA" would be appriciated.