I got one of the $40 Office Depot flight cases and after 7 months its doing fine. Even if I have to buy a new one every year to make sure it doesn't come apart on me during a trip I'm still ahead of the game compared to a "quality" bag.
I picked up a buddy's skid plate reinforced bag and couldn't believe the weight. To me the weight difference is enough alone to pick the cheap bag.
And the Costco rollers are excellent for others like me on a budget.