The Teaching and Learning Center (in LRNC-208) has a fabulous, super-high quality digital audio recorder available for LSC-CyFair faculty checkout. Check with your campus for something similar at your place if you're not a CyFairian.
Download this to make recordings on a laptop or a desktop. Don't forget to download the LAME encoder as well, or you won't be able to export MP3's. MP3's are your best bet for file size.