I need help with LOOKUP or VLOOKUP.

I have two EXCEL 2000 documents ( Estimates.xls and Prices.xls).

(this is a snapshot of ESTIMATES.xls)
A B C
1
2 Product Description Est Price
3 400 _____ $____
4 600 _____ $____
5 900 _____ $____

(this is a snapshot of PRICES.xls, Tab or Sheet 1)
A B C
1 Product Description Price
2 400 Red XYZ $47.00
3 500 Blue SPQ $68.00

(this is a snapshot of PRICES.xls, Tab or Sheet 2)
A B C
1 Product Description Price
2 600 Green XYZ $40.00
3 800 Brown SPQ $88.00

(this is a snapshot of PRICES.xls, Tab or Sheet 3)
A B C
1 Product Description Price
2 900 Black XYZ $70.00
3 950 White SPQ $38.00

I would like to type a product code into cell A3 on ESTIMATES.xls and have
it automatically populate cells B3 and C3 with info from the PRICE.xls. The
PRICE.xls has 3 tabs or sheets that need to be searched in order to populate
correctly.

Any help with this is appreciated.
(ps: I'm a beginner so please use details in wording)
Michelle