The Sekonic L-358 goes down to 3. Just checked it. I was looking to sell mine Jason, so if you can't find anything and you are interested let me know...
To help you out though, my Gossen Luna Pro Digital (no flash) goes down to 3 as well, but it also has a corrective function, so it could be dialed down to 2 with the correction (it has an 8 stop corrective ability I think). The modern version of it is the Sixtomat F2 and I just checked it. Looks like it will work for you. I'd assume the other Gossen meters do that too, but you'd have to check.
The Sekonic L-558 also goes down to ISO 3. It has a button labeled "ISO 2" that lets you apply an offset to the measured value. That can be as low as -5 stops. That gets you way below ISO 2 (but you have to press that extra button to see it).
Forgive me for barging in but In just picked up a Sekonic 358 and this question may come up for me when I start using it with my flash, what does ISO 3 exactly mean and why is it needed to properly meter flash photography?
The OP is using blue-sensitive glass plates that approximate the dry plate emulsions available in 1880 or so. They have an approximate ISO speed equivalent of 2 (or less, depending on the color of the light). In fact, these plates are slower than common enlarging paper, by about 1.5 to 3 stops.
Forgive me for barging in but In just picked up a Sekonic 358 and this question may come up for me when I start using it with my flash, what does ISO 3 exactly mean and why is it needed to properly meter flash photography?
It means it is half as light sensitive as ISO 6 and twice as sensitive as ISO 1.5. Its like Portra 400 is ISO 400, this is for emulsions that are MUCH less sensitive than an ISO 400 film.