Hi I'd to know if anyone knows the cost of 500' 2/0 aluminum wire.

You need to specify more than gauge and length. Here are a few choices of types of wire. Once you naroow it down you may get your answer from this very site. http://www.cable.alcan.com/alcancable/en-US/Products/United+States/

Hey, its xhhw aluminum wire used for a service entrance

Im sorry its xhhw aluminum wire used for service entrances

Here is your price sheet for uhhx. http://www.cable.alcan.com/NR/rdonlyres/22FFFC74-C3F5-4080-ADDE-5E5D64380D5B/0/NRBW.pdf

Best to contact a local distributor for accurate current prices, the prices listed from manufacturer, is rarely the correct price, may be list price, or the distributors cost, etc.