I've held onto this for too long, but notice that others seem to want this set-up for their IIGS's.
I'm selling the Apple brand High Speed SCSI Card (shipped in an antistatic bag) with the cable to the back of the machine (and mounting screws), the original 3.5" software disk that came with it (works great), and a photocopy of the manual, which is also available online in PDF form (if you'd like the hardware/software but want to save on the shipping of the manual). I'm offering it here first for $100 for the Applefritter crowd for a week (until June 1). Then it goes up on ebay, where I've reasonably seen them sell for $125-$150, but I haven't seen one there in awhile, so it might go for a bit more than that.
I also have a compatible SCSI Apple tray loading CD-ROM drive model #300ePlus (from 1994), the cable that connects the drive to the SCSI port, and a SCSI terminator. While the paint isn't cosmetically perfect it's not terrible either, but it seems to work just fine. It can be used with a IIGS, but as far as I've been able to discern there aren't any drivers for it to work with a IIe. An older model of this just went for $36 on ebay, without the cable and the terminator. Again I'll offer it here for $30 for a week, then on to ebay starting at the same.
The shipping price for just the card is $6.00, with insurance $7.50 (tack on $2 for the paper manual). For the drive it's $15, $16.50 with insurance. If you buy both I'll ship it all for $20 insured. These rates are for within the USA. I will ship overseas, but the cost goes up accordingly. A US postal money order is the preferred method of payment, but if you want to use PayPal, tack on their 3% domestic fee, and we'll calculate it for international buyers.
Just the card and it's connector to the back of the CPU box have been claimed. I'll sell the original disk for $3.00 including shipping the USA. The CDROM drive, external SCSI cable and terminator are still available.