The Wayfarer's Inn

Bags of Holding are good for that. Keep in mind though that the opening of the bag isn't too big, so items must be small to fit. A suit of plate mail wouldn't fit in, for example.
And yes, Gaderon is 14th level and may teleport 800 pounds in addition to himself.

I'll wait with my next posting until you've decided whether you want to flee or fight.

Hi, Sir C. Actually, it should be 8500gp and 850 pounds, according to the All Spells pdf you gave us.
So, who's there to transport?

Eilkhan
Sol
Ivid
Elmo
Kherim
Ahi

Not counting gear, at an average of 170lbs per char, that is 1020 lbs already. But perhaps we should make better estimates for each one, but I'm not very confident. 170 lbs is already a low-ish figure for bulky fighters.

I just noticed that Gaderon can cast the globe of invulnerability using his staff of power, would that help in this situation?

Say, if we fight how long can we hold? We'e got 9 adversaries, and not one has fallen yet. Ahi is high on healing spells but he can only heal one person per round. Ordinarily, I think he'd have a fair chance of turning mummies, which might be enough for a relieft, but in here I'm not confident. He failed on the mummy-zombies with a 15, so that's not a good sign.

Kherim could deal some damage, and I'm sure Gaderon's fireball helped, but even though, how long will it take til the first one falls? If Ahi can not turn the mummies away, then they will decimate that side of the battle and eventually the whole group, so we face a TPK.

At least with a teleport, we could save a number of people, but I bet who ever is left behind will not survive and, worse, may be turned into an undead and not resurrectable.

Flight.

So, the next question is who stays behind. Also, are these things slow? Can we outrun them? Gaderon does have a passwall spell. That could still save us a lot of trouble, if we find a nice spot to retreat on the map.

Would these undead be sufficiently intelligent to crawl through tight spaces?