They are now tradeable on the Grand Exchange, 100/4 for the quantity limit.

 

Why does the website say they're not tradeable?  They've always been tradeable, just not through the G.E. up until recently.

 

Credit: Persiflage (not me!)

 

 

Also, forges yield 10% more experience when smithing on them, not just the chance of saving bars.  And to make your statement about saving bars precise, you can expect to save 10% of the total bars from smithing an item, i.e., expect to use 2.7 bars on average from making rune platelegs.  You can save multiple bars at once and even occasionally make an item scotch-free!  [All from personal experience.]

 

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I just noticed we don't actually have portable sawmills in the database, so here you go:

 

 

Examine: A portable sawmill, for your on-the-go plank-making needs.

Members: Yes, Quest: No, Tradeable: Yes, Stackable: Yes.

Weight: 0.00kg.

It provides some bonuses to Construction and I think a chance of protean planks but I'm not really able to research it further at this time.

Tags: Construction, Treasure Hunter.

You can copy the description for location from one of the other portables; it's the same.

Thanks for this information, the item entries have been added/updated and credited. 

I still don't see portable sawmill in the item database, at least when I attempt to search.  Am I missing something?