Marketing dollars are typically invested with an ad agency and PR agency. These agencies typically take care of branding, sales materials (brochures, floor plans, etc.), website, print design, etc. Media buys can range from magazine ads (The New Condo Guide, newspapers, etc.) while some projects use radio, TV, billboards, and transit ads. There's also a bigger push for online advertising (banner ads, Facebook, etc.)
There's usually direct mail sent to brokers/agents, typically invites to launch events.
Sales centre prices vary - the most expensive I've seen recently were DNA3, Treviso, Thompson and topped by Bisha (I believe Bisha was $4 million but I'm not 100% sure). The Yorkville has a pretty large site as well.