Javascript to retrieve the value of the price list in a CRM quote
The price list field on a CRM quote is a "lookup field". There is special syntax required to retrieve data from a lookup field.
Code tested with CRM 2011:
var pricelist = Xrm.Page.getAttribute("pricelevelid").getValue();
var pricelistvalue = pricelist[0].name;
If you want to see it in a message box, add:
alert(pricelistvalue);