Depending on the vendor's policies, you may have to pay for all shipping. Further, some of them will charge you to test the returned part and a restocking charge if it is found to be OK.
Be sure you haven't done something in the BIOS setup that turns off the floppy port. I have found that it's easy to do and not entirely obvious. Recently, I lost the floppy drive using the "Load Fail-Safe Defaults" setting. When I switched back to "Load Optimized Defaults", the floppy was operational ... go figure!
Jingles