The Asian primary, and troubleshooting cartridge for this scanner is not hard to find, and for less then 30 bucks you can buy both for the 1983 to 1997 model year Asian imports, and this cartridge covers all Asian imports, not just Toyota's.
Snap-on Scanner MT2500-1497 Asian Imports 1983 -1997 Troubleshooter OBD-II Insig | eBay
Snap-on Scanner MT2500-1497 Asian Imports 1983 -1997 Primary Cartridge OBD-II | eBay
Plus for another 73 bucks you can buy a used scanner kit, and most of these scanners kits come with the Toyota adapter to plug it into the OBD1 plug used on Toyota's.
Snap On Scanner Mt2500 With Cartrdiges And Case | eBay
But in case the scanner kit doesn't happen to come with the Toyota OBD1 plug, they are easy to find, and cheap, here's one for only 15 bucks.
Snap On Scanner MT2500 MTG2500 Solus Ethos Modis Verus TOY-1 Adapter MT2500-50
So for less then 150 bucks for the scanner, 2 cartridges, Toyota OBD1 adapter, and shipping you can have a professional grade scan tool, in my book that's cheap for the level of performance this tool offers.
Plus if you own other makes, and models of cars you can test those too with this scanner, whether they be OBD2, or cars with the new OBD2/Can bus hookup through the 2009 model year. All in all i guess it all comes down to what you want. Do you want a professional grade tool, that'll do more then one vehicle, or do you just want something that only does the 91 to 94 Land Cruisers. Cheers