There are a few options, really depends on the flow rate you need. There is a lesser range in Toyota OEM low resistance injectors than with high resistance. Once you decide on your requirement, it then becomes a problem to source them. A number of the engine types didn't come here. i.e. 22 RTE 4 runner turbo engines are hard to find but have a 250cc orange / yellow injector or 295cc pink injector. Just try finding them though. Having said that, there is a guy on U.S. ebay with a set of pink 22 rte's right now. otherwise it seems everything is 200cc (3SFE, 4YE, 22RE, 4AGE [pink] etc or less. 7MGE's are 295cc (yellow) and then they go up again in limited sizes.
Other options are to use other manufacturer injectors but many don't use a toyota style fuel rail which means they don't simply bolt in. i.e. Nissan barb fittings for example.