According to this site, you can refuse UPS's brokerage fees and self-declare your item (below $1600 in value) at a local CBSA office.
Cliff's Notes:
Source: UPS Brokerage Fees – Total Scam, Fraud, Cheating. How to avoid it
After you order
* Print out your commercial invoice (PayPal invoice, or e-mail receipt from the store). You may want to make sure that shipper will put the correct price on the package for customs (just send them a note about it)
* Wait for item to be shipped and get your tracking number
* Call UPS, give them tracking number and tell that you want to clear your items by yourself in your local CBSA office. They should instruct you what you will need to do