Hi. There is a small bug in magento that does not calculate tier pricing correctly for bundle products in checkout.
For example, if I have a bundle product called "Computer". I have a simple product called "Blank DVD's" associated to it, with tier pricing (1=£20, 5+=£15, 10+=£10).
If the customer checks the option for blank dvd's, and orders a quantity of 5 total bundle products, the tier price of £15 should be applied (£15*5 = £75), but it calculates at (£20*5 = £100).
This should be a simple code change for cart total, the code simply needs to tally up all simple products in the cart and checks if they have a tier price. $50 Budget.