Harbor Freight in Leesburg has similar ones.
They are often called 'wheel chocks'.
http://www.harborfreight.com/solid-r...ock-96479.html
HARBOR FREIGHT STORE
LEESBURG, FL #00468
2257 CITRUS BLVD
LEESBURG,FL 34748
352-435-0010
Get Directions
STORE HOURS:
M-F 8:00AM-9:00PM
SAT 8:00AM-9:00PM
SUN 9:00AM-6:00PM