Deadlift without the belt, or don't deadlift for a while. Unless you are really built for deadlifting, short legs and long arms, then deadlifting every week will probably be counterproductive anyway.
As far as he belt goes. Order a good one from Inzer 1-800-222-6897. They are kind of expensive but they are guaranteed forever. I have had mine for almost a year and you can hardly tell it didn't just come out of the box.
I am a very very shitty deadlifter, around 100 lbs less than my bench. So take this with a grain of salt, but it is possible to increase your deadlift without deadlifting. By strengthening the deadlift muscles without actually deadlifting, you should be able to bring up your deadlift without tearing yourself up too much.
I was just looking at an old training log, and I have brought my deadlift up by 70 lbs in the last year by deadlifting at the most twice every six weeks, and that is usually some modification like pin pulls.
Hope this helps,
B.