Up here in Canada there is actually only one company that makes it. It's usually under the name "LPL Mastic Putty" and comes in a 1lb plastic baggy.
I don't know what companies in the USA make it/carry it.
I do know that Viking Sales in the USA carries the Swedish made stuff...
http://www.solventfreepaint.com/window_glazing.htm
...it's really high end stuff. Closer to Restoration/Heritage quality. But it is really excellent to use.
The every-day Putty comes in a little plastic pouch. You can usually see the yellow linseed oil separating in the pouch. Just like the way peanut butter separates. It's not as awesome as the Swedish stuff, but it is easier to get a hold of.
I also recommend the Silent Paint Remover from Viking sales. I bought mine from the Canadian distributor....but it's the same thing.
These paint strippers make Heat Guns look like a base model Honda Civic compared to a Lamborghini. I've never used one that makes stripping paint so easy.
http://www.silentpaintremover.com/
(again...I'm not affiliated with any company...I'm just showing what I have used over the years and what works consistently)
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