Can I buy shares without contacting the broker( not paying commission )?

My reading of late says that the broker is the go-between for the buyer and the market so you need one to buy stock.

However if you have a specific stock in mind and it is for a large company, sometimes you can purchase stock through their own stock purchase plans. I checked out Ameren Corp. and they allow individuals to invest via applying for an account by mail. There is a small charge for purchases etc. but I've found this to be inconsequential. And their brochure will advise you of the costs.

So if you have certain stocks in mind, check the company's website - usually under "investor services".

Online brokers can be fairly inexpensive, but read all the fine print because sometimes the lower commissions only apply for big account holders.
Wrenwell.

Brokers in general are not that expensive.

To make a trade with a major bank here in Ontario (CIBC), they will charge you $25

Check the following link. If you don't mind doing your own research you can trade relatively cheaply. I use Scottrade for $7 per trade. I've seen advertisements for some even cheaper.
http://www.dfin.com/ldisc_brokers.htm