By all means do not get them to install it for you. These "tech" people are scam artists some even charge you to pair a bluetooth headset to a phone 25 bucks at that. Theres nothing technical about connecting 3 ethernet cables, it's extremely easy, ill diagram it for you.
Cable or modem device (where you get your i-net from)
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|_______________ New Router's main or master "in" port
Thats the one not directly close to the others, then you have 4 or 5 that are close to each other on the other side of the back, just connect one cable to each computer's ethernet port and presto your done!
PS: Please send the 50 bucks they were going to charge you for that to the I need more morphs foundation at the link below:
(JUST KIDDING!)
The router listed above is good and really easy to install.
Have Fun!