CD versions have been discontinued and are never likely to return. The official 'solution' to this is to remaster the iso and remove packages until it is the right size.
Because of the size of the content, and the fact that a vast majority of systems nowadays can either boot from DVDs or from USB, Linux Mint no longer provides images which fit in 700MB CDs. It is however possible and easy to to modify ISO images. By removing packages such as Java, Mono, LibreOffice, Gimp..etc.. Linux Mint ISOs can be made to fit within 700MB.
BTW. If you have an existing LInux distribution installed with a grub2 bootloader then it is possible to boot and install directly from the iso without having to burn anything at all:https://help.ubuntu.com/community/Grub2/ISOBoot
But it isn't easy
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).