Help with Magic Item Combination Pricing

[Jeremy]

Under the new 3.5 rules for combining items, what would the approximate price be for a combination of these three cloaks from Magic of Faerun?

Cape of the Fire Bath
Traveller's Cloak
White Cloak of the Spider

Though if it really comes down to it I'm basically interested in these abilities:

Endure Elements
+2 resistance to saves
+2 luck to Fortitude saves vs. drow poison and sleep
Create Food and Water 3/day
Enlarge Cloak (to become a tent) 1/day
Spider Climb (at will)

 

[Thanee]

You multiply all costs of non-similar abilities (except for the single highest cost ability) by 1.5 and then add together.

Bye
Thanee

 

[Thanee]

About the individual costs...

Endure Elements
> continuous 1st level spell: 2,000 gp

+2 resistance to saves
> bonus² x 1,000 gp: 4,000 gp

+2 luck to Fortitude saves vs. drow poison and sleep
> pretty low... 500 gp?
> An item, which would grant +2 luck to all Fort saves would be worth 2,000 gp.

Create Food and Water 3/day
> since it's only for a single person, probably also pretty low... 1,000 gp?

Enlarge Cloak (to become a tent) 1/day
> really just a small gimmick... 500 gp?

Spider Climb (at will)
> continuous 2nd level spell: 12,000 gp

Bye
Thanee