"Discovery Guide 2012/2013" London- available at the information centre. Picked one up for a visitor and here are the coupons- most good until April 2013.

Days Inn 59$+ tax
Via rail up to 75% off express deals (no different than on their website and express deals are super limited in locations and times so much so I've never been able to get it)
Budapest restaurant 10% off food purchase (dinner only)
Children's museum- 1/2 price children's admission with paying adult
Delta London Armouries- 50% off racks rate for accommodations or 15% off Armouries Grille- dinner only
East Park- 2 for 1 Mini golf
Holiday Inn Express- 10% off regular room rate with complimentary parking
BOGO Pioneer village admission up to Oct 8th
Fanshawe College Conference Services- 64.45$/ night for 2 bedroom suite or 124.45 for 4 bedroom suite
Palasad- Buy entrée at regular price, get 10$ off 2nd entrée of equal or lesser value, or buy 1 bowling game get 2nd one free
2 for 1 admission Bump, Baby and Toddler expo at western fair district- next ones Nov 2-3 and 3-4
Fleetway- 5$ off bowling with 10$ minimum purchase
Marble slab- buy 1 cone, get 1 at 50% off
Executive suites- 15$ off 1 night, 30$ off 2, 50$ off 3 nights
Marienead Restaurant Chaucer's pub- free homemade strudel with any entré over 12$
McDonald's- buttermilk biscuit sandwich and hash brown get another sandwich free
Museum of ontario archaeology- buy 1 get 1 free admission or 8$ family rate
Museum London- free gift (art or history publication)
Comfort Inn/ quality suites- 20% off regular rate
Station park all suite hotel- 50% off rack rate sunday night stay only plus taxes
Adventures on wonderland- 2 for 1 admission
Tony Roma's 10$ off purchase of 50$ or more

***By the way, they have new bike and walk maps published this spring.