anyone can recommend me a company

I'm looking for Point of Sale Equipment
for my real estate business that is compatible whit 3dcart
i need a cash register whit bar code that when i sell a product it would remove it from my website inventory as well
if someone know a company that have a guys that can come install all this for me in Canada would be great

i was looking a stone edge but they don't have any sell rep. in Canada
Is there any other company?

or anyone in Canada Ottawa that use stone edge?