If you don't want a tower then you have three choices:
1. Buy an A1200 Blizzard accelerator with a SCSI card, and connect a standard PC SCSI CD-ROM drive. By far the most expensive option (ebay prices are £100-£200 for the accelerator, and the SCSI cards are ultra-rare, probably another £100-£200) but also has the fastest data transfer rates.
2. Buy a HiSoft Squirrel PCMCIA SCSI interface, and you can use a standard PC SCSI CD-ROM drive, but only up to about quadspeed, I believe. There are also known issues with Squirrel's overheating and freezing A1200's during long data transfers (I've experienced this myself). Squirrels go for about £30-£40 on eBay, probably another £30-£50 for the SCSI drive and case.
3. Buy an Amiga Technologies Q-Drive 1241 (the official CD-ROM for the A1200). It is a quadspeed drive and uses a custom PCMCIA interface (much like the Squirrel). I sold one last month on eBay for £144,
see here.
Anyone please feel free to correct me on any of the above!
Steve.