Where to buy?

Purchasing a jamb peg. There's not a lot of choice

There are a few styles of jamb peg machines around, but unfortunately most of them are not readily available.
Be wary of the cheap jamb pegs online. I see a couple with the table attachment but most of them are without any method of cutting tables. The table attachment is a must have, and for a hobby cutter this will make cutting so much easier.

The industrial jamb peg manufactured by BHandasa in Israel, check if available. Top of the range.
The FraLap is a traditional style French jamb peg, check it out here, FraLap There is an English version of the website.
The Som from KMT India is a hobby jamb peg, very well built and accurate.
The Brahm from KMT India is an industrial jamb peg similar to the BHandasa, Som and Brahm uses the same head.

The most affordable jamb peg would be the Som, which includes the table attachment. manufactured by Kalpana Machine Tools
I have provided links below. I now have a Som jamb peg and the head is very well built, no complaints at all. See the next page for more information.

Except for the base, the Bhandasa and Som faceting head are almost identical.
A good quality jamb peg is going to give you a life time of trouble free cutting.

The SOM Head

If you have your base with a 16mm wide slot and you can add a 35mm hole to accomodate the mast base then this would be a good option, but you will need reverse to use the table attachment. If I bought any one of these machines I would also purchase extra standard dopsticks. 8 sided and 6 sided for triliants, you can't have too many.
Take a look here

The SOM desktop

The Som is a hobby cutters machine, not too big, and portable. Compare the setup to the Bhram, notice the arm rest? If I had this machine I would figure out some way to make an arm rest. This will give you much better control over your cutting
Take a look here

The Brahm jamb peg

The Brahm is an industrial system. Has a 3 phase motor with speed control and mounted in a table. For a serious gem cutter this would be my choice
Take a look here