I know nearly all big consulting firms (and consulting departments of the Accounting Big 4) usually pay for 100% of tuition fees. Some of them will only sponsor you at certain schools (where they have cooperation agreements), while others will let you choose.
As someone already mentioned though, in order to enjoy their sponsorship, you've got to sign a contract saying you won't leave the firm for the 2 years following the MBA.
Hope this helps
Not just the 2 year contract issue but also usually requires a minimum amount of time with the firm to be considered for it - typically this is a year at most companies I know. Keep in mind that a LOT don't pay 100%...
I shoulda stayed at the firm that did pay 100%