ok -- Take it easy,
1) You do have IDE because you sure as he11 don't have SCSI.
2) No ones addressed your original question directly because it seems very strange that an old controller card would help you to address space on a HD.
3) You can probably buy controller cards @ compUsa, Frys or MicroCenter however I doubt this is gonna help you... I think the person that told you a PCI controller card would help, did not understand the problem. As far as price controller cards run between $35-65 for the ones Iv seen.
You can also get cards online @ places like tigerdirect.com or pcmall.com or even Ebay.
On a different note: when you come to a free technical support forum and ask questions of a 100% VOLUNTEER staff, in the future I would have little less of an attitude in my posts. Everyone that responded did so in an effort to help you out, whether or not you realize that is not my problem.