You will need a 5.25" floppy drive to read the data, if it is still readable. I suggest you check with vendors that specialize in reselling used equipment. We have a fleamarket my my home that has a computer show once a month. Many of the vendors sell nothing but used parts. Most from parted out older machines.
Another option might be to try an independent computer shop. They may have an older machine that has the needed drive. Should be a simple matter for them to copy the data to some other media.
How to proceed would depend on how many disks you need to read.
You may want to check your BIOS to see if it can configure a 5 1/4 drive. If so you will also need the correct cable.
There is a member here that may be able to fix you up. His handle here is DAVEINCAPS. Try sending him a Private Message here to ask.