You can probably save money making an item of 3/day Jump, Expeditious Retreat, and Spider climb. It isn't exactly the item in the comic strip, but it grants 9 spells per day. I think that's 1200 gp for the jump and expeditious retreat each. Actually, you'd probably do well with 1 charge of expeditious retreat (1 minutes = 10 rounds), so that's 400 gp. Give them the ability to use it spread out instead of as one casting for double price (seems fair) and make it 800 gp. Then take 50 charges of spider climb for 6000 and you've got 8,000gp boots that give you running, jumping, and some spider climbing. That's the price of a +2 stat item, isn't it? That's not terribly cheap or over expensive, is it? I dunno, I sort of winged it.