Air supply for Portable Hole?

[Von Krieger]

As a result of a previous question, I've ended up using an Enveloping Pit as a home away from home for my character, but I'm finding myself in a pickle. The only air supply type item for when I pull in the hole behind me that I can find is a Bottle of Air, which is pretty pricy at 7250 GP.

Is there something out their that is less expensive that would fulfill the same function?

[Tr011]

Stronghold Builder's Guide has an enchantment that supplies with air... but I'm not sure about the cost.

[Von Krieger]

Stronghold Builder's Guide has an enchantment that supplies with air... but I'm not sure about the cost.

Chamber of Comfort, 7500 GP. Though for +250 it also gets rid of smoke and such. Thanks for pointing this out. If I'm stuck with the Bottle of Air, I think I'll spend the little bit more to make it a rather nice room.

[kitep]

The DMG lists Necklace of Adaptation and Ioun Stone (Iridescent Spindle) as items that let you live w/o air.  But at 9000gp and 18,000gp, they're even more expensive than the Chamber of Comfort.