1632systems has
Dev Cards at £200
Dev Card + Dev Jag £250
www.1632systems.co.uk then into the webshop/atari catalog/jaguar
BEST
http://www.best-electronics-ca.com/jaguar.htm
Dev Card $495
Dev Console $99
Dev Manual $85
B&C
http://www.myatari.com/bcjaguar.txt
JAGMOD Jaguar with developers ROM $99.00
JAGCDD Jaguar CDROM developer version $150.00
JAGCDE Jaguar CDROM Emulator cable/ Atari Falcon $50.00
Curt Vendel has Dev Cards at $300 including manual if i remember correctly. Have a look at www.atariage.com forums.
Be aware that its not TOO difficult to modify a stock Jaguar to turn it into a Dev jaguar.
Thats all i'm aware of for the moment.
All the listed cards will be 2MB as the 4MB ones are very hard to find.
You can get the manual in pdf format from StarCat at www.atari-jaguar64.de on a CD of development tool sfor 15€.
Dev CD not really vital, particularly as the CD encryption code has been found.
If you want to experiment, then you could do a lot worse than get one of the underground developer tools.
Basically these provide a method for getting code into the Jaguar RAM but don't allow use of the ROM space like an Alpine |Dev card would
They are:
1. a Jaguar modified with BJL
2. get Protector SE which has a built in BJL loader
3. get a copy of Battlesphere Gold and load in code via JUGS.