I have set reminders on eBay for a number of collectible S&W bits including T-grips. I've managed to come away with a couple good ones so far. They often have new ones on there as well.
I recently got one off of Guns America as well. No idea about the brand new ones. I haven't found the difference in price to be all that much. Unlike stuff like stocks/grips, most people won't pay a huge premium for older ones.
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