NgraveR in Ct is where I'v bought alot of blank bits & handles from in the past.
http://www.ngraver.com/index.htm One of the links on the bottom of the home page is the price list
I used their 'Belgian style' steel handles for about 30yrs. They take a 3/32" sq tool bit or an 1/8" rd.
It'll take an 1/8" square too if you just grind a touch off of the edges of the bit that slips up into the handle.
Simple set screw to hold them in place. Handles are square in profile. Nice having the dead weight of the steel when hammering. I used wooden handles before that and though they worked well, the steel handles improved my work greatly. The weight of the (steel) handle is actually an advantage.
When I used pre-shaped gravers early on, I used wooden handles. I tried all sorts of different shapes of handles both for chasing and graver work. Some bought, some home made.
You have to experiment for yourself to find what works best. Everyone will have a 'best one',,but it will probably not/may not be right for you.
I ended up putting some of the pre-shaped gravers (liners especially, some specialty bent shank cutters,ect) into the Belgian style handles. They worked the best for me.
No need to get in to Carbide gravers. Unless you are going to cut Ruger #1's and Winchester 21's and want to spend $$ on diamond sharpening hones to point them up.
HHS or Cobalt will do fine.
**I did not have good luck with the NgraveR brand preshaped gravers. I can't recommend those.
Some searching to find a supplier for pre-shaped gravers will need to be done. They used to be very common,,not so much anymore.
Steve Lindsay sells his air assist machine but also some tools. His CarBalt tool bits are very good. Nice website to look about. Lots of ideas and tips.
http://www.lindsayengraving.com/GRS has GlenSteel graver blanks and roughed out points. I've never used them but alot of engravers really like them. Lots of other stuff on their site.
They have some HSS traditional shaped gravers. The shanks are shaped for their air assist handles,,but they'd probably fit nicely into a wooden or the Belgian handle too.
http://www.grstools.com/gravers-burs-and-more/glensteel/glensteel-gravers.htmlLearn to sharpen the tool correctly or wander aimlessly wondering why it cut so nicely before and so terribly now.
At least there are books, videos, DVD's, internet and seminars now to show you how it's done.
When I started, most still put their apron over their work and tools so no 'secrets' got out when they walked away from the bench. There wasn't a free flow of information that's for sure!