Be careful, not all pads are the same! Allot of shops advertise $99 dollar brake jobs, however what you get is typically not a proper job.
A proper pad replacement job requires new pads, resurfacing or replacing the rotors. Some shops will provide just the pads and skip the rotors. Doing so can cause squealing, poor braking ability and abnormal pad wear.
In addition to that, pads come in several form. From the inexpensive metallic to the ceramics. Ceramic pads provide the best braking and a longer life but come with a higher price tag.