Toys R Us are selling Chuggington Trains for 30% off. This works out to 6.99 for the Wooden Railway engines (compatible with Thomas, Imaginarium and the like).
I checked out Toys R Us at Garden City and they had plenty of Koko, Wilson and Brewster so I got those for the kid.
No deals on either track or play sets. A 7 piece "beginners" track set is $30 and is basically glorified Imaginarium. Chugger that. Just buy the trains and get the track elsewhere.