Been paying for supplies at my company and the reimbursement checks have bounced....?

You may not like my answer, but it's time you contacted an attorney because it looks like the company may be going belly up and you need to be on record with an attorney so you can file for payment before they go bankrupt. This is happening all over the country thanks to the horrid economy. You shouldn't have fronted the expenses yourself when you knew the vendors were having problems, but you did. Now it is going to take a legal claim to try and get that money back and there is a darn good chance you will only see a portion of it from the way you describe them.