HELP T7 phage needed

[Wojtek]

Hi, 
I have a question. I have an expression plasmid (with His tag) 
in which the fusion protein gene is under T7 phage promoter. 
To express the protein I will need to infect transformed E. coli
with T7 phage? Am I right? Then, where to get T7 phage from?
I checked several companies and didn't find the one selling
T7 phage. Which company sell it? Or, maybe, you get the expresion
some other way? Thanks in advance for help.
Krzysztof