INA126 which needs a bipolar supply (else output won't go all the way to ground) and has a minimum gain of 5.
MCP6021, but that would entail the hassle of either getting precision resistors or manually matching four. It also increases the parts count. So that got me wondering why Microchip--given their wide range of op amps--hasn't taken the next step and developed instrumentation and difference amplifiers. Do they lack the capability to make these high precision components? Is the demand for these items too small? Is that market cornered by Analog Devices and Texas Instruments?
It's still on my wishlist and hopefully Microchip does get around to fabricating IAs in the near future. I'm sure they'd be more affordable than, say, the AD623.